Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will deacy in time

Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will deacy in time
by

1 Answer

Answer :

Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will ... ` C. 4T D. `2 (log_(e) 2) T`
by
selected by

Related questions

A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of the `alpha-` particles in sucession. The group of the periodic tablle t

Description : A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of the `alpha-` particles in sucession. The group of the periodic tablle t

Last Answer : A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of the `alpha-` particles in ... 6th group C. 14 th group D. 16th group

The time required for half of the __________ of a radioactive isotope to decay is called its half life. (A) Nuclei (B) Electrons

Description : The time required for half of the __________ of a radioactive isotope to decay is called its half life. (A) Nuclei (B) Electrons

Last Answer : (A) Nuclei

75% of a radioactive element decays in 6 hours. Its half life period is __________ hours. (A) 3/4 (B) 1/6 (C) 3 (D) 4

Description : 75% of a radioactive element decays in 6 hours. Its half life period is __________ hours. (A) 3/4 (B) 1/6 (C) 3 (D) 4

Last Answer : (C) 3

Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but lighter `._(2)H^(3)` cannot. Reason `(R) :` The

Description : Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but lighter `._(2)H^(3)` cannot. Reason `(R) :` The

Last Answer : Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but ... D. If both (A) and (R ) are incorrect.

If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be _____. A. Radioactive B. Stable C. Isotopes D. Isobars

Description : If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be _____. A. Radioactive B. Stable C. Isotopes D. Isobars

Last Answer : ANSWER: A

The activity of a radioactive element reduces to `(1//16)th` of its original value in 30 years. Find its half life?

Description : The activity of a radioactive element reduces to `(1//16)th` of its original value in 30 years. Find its half life?

Last Answer : The activity of a radioactive element reduces to `(1//16)th` of its original value in 30 years. Find its half ... B. 75 trs C. 7.5 day D. 75 month

When viewed under a microscope a sample of tissue reveals striations and long thin fibers that contain many nuclei and mitochondria. What type of tissue is most likely being viewed?

Description : When viewed under a microscope a sample of tissue reveals striations and long thin fibers that contain many nuclei and mitochondria. What type of tissue is most likely being viewed?

Last Answer : Need answer

Microsoft Word was initially known as: a) Micro Word b) Multi - Tool Word c) Sample Word d) None of These

Description : Microsoft Word was initially known as: a) Micro Word b) Multi - Tool Word c) Sample Word d) None of These

Last Answer : b) Multi - Tool Word

A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain after 3000 years,

Description : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain after 3000 years,

Last Answer : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain ... g of the sample D. 0.01g of the sample

The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` decay. The atomic number and mass number respect

Description : The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` decay. The atomic number and mass number respect

Last Answer : The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` ... is: A. 92234 B. 94230 C. 90230 D. 92230

A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. = 45) is dissolved in 100 ml water and titrated with 0.5 M HCI when of `((1)/(5))^(th

Description : A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. = 45) is dissolved in 100 ml water and titrated with 0.5 M HCI when of `((1)/(5))^(th

Last Answer : A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. = 45) is dissolved in 100 ml ... D. Weight percentage of base in given sample is 80%.

The decay constant for an `alpha-` decay of `Th^(232)` is `1.58xx10^(-10)s^(-1)`. How many `alpha-`decays occur from `1 g` sample in 365 days ?

Description : The decay constant for an `alpha-` decay of `Th^(232)` is `1.58xx10^(-10)s^(-1)`. How many `alpha-`decays occur from `1 g` sample in 365 days ?

Last Answer : The decay constant for an `alpha-` decay of `Th^(232)` is `1.58xx10^(-10)s^(-1)`. How many `alpha-` ... )` C. `2.219 xx 10^(19)` D. None of these

(3) two light nuclei combine to form a heavy nucleus Explanation: Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei. The difference in mass between the products and reactants is manifested as the release of large amounts of energy. Fusion is the process that powers active or "main sequence" stars, or other high magnitude stars.

Description : (3) two light nuclei combine to form a heavy nucleus Explanation: Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei. The difference in mass ... . Fusion is the process that powers active or "main sequence" stars, or other high magnitude stars.

Last Answer : Helium is added to the oxygen supply of deep sea divers because it is - (1) less poisonous than nitrogen (2) (2) Lighter than nitrogen (3) Readily miscible with oxygen (4) less soluble in blood than nitrogen at high pressure

What name is given to the time taken for half the atoms in a sample of a radioactive isotope to decay?

Description : What name is given to the time taken for half the atoms in a sample of a radioactive isotope to decay?

Last Answer : Half-life

The rate of emission of radiation, when a radioactive sample is placed in water,_________.

Description : The rate of emission of radiation, when a radioactive sample is placed in water,_________.

Last Answer : The rate of emission of radiation, when a radioactive sample is placed in water,_________. A. ... C. remains the same D. Cannot be determined

Monazite sample contains 9% `ThO""_(2)` and 0.35% `U""_(3)O""_(8).Pb""^(208)` and `Pb""^(206)` are the stable and products in the radioactive decay se

Description : Monazite sample contains 9% `ThO""_(2)` and 0.35% `U""_(3)O""_(8).Pb""^(208)` and `Pb""^(206)` are the stable and products in the radioactive decay se

Last Answer : Monazite sample contains 9% `ThO""_(2)` and 0.35% `U""_(3)O""_(8).Pb""^(208)` and `Pb ... C. It is a fertile material D. It belongs to 4n series

A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant `=N_(A)`. The initial activity of

Description : A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant `=N_(A)`. The initial activity of

Last Answer : A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant ... N_(4))/(M)` D. `mMe^(lambda)`

If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?

Description : If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?

Last Answer : 3

Taking the values of atomic masses from the tables, find the maximum kinetic energy of beta-particles emitted by `Be^(10)` nuclei formed directly in t

Description : Taking the values of atomic masses from the tables, find the maximum kinetic energy of beta-particles emitted by `Be^(10)` nuclei formed directly in t

Last Answer : Taking the values of atomic masses from the tables, find the maximum kinetic energy of beta- ... )` nuclei formed directly in the ground state.

The following are true : a. the HLA proteins are found within the cytoplasm of the cells b. HLA class I antigens are expressed on all cells with nuclei c. HLA class II antigens presents the virus infected cells to cytotoxic T lymphocytes d. HLA genes are found on chromosome 6 e. HLA tissue typing is carried out in all forms of transplantation to prevent rejection

Description : The following are true : a. the HLA proteins are found within the cytoplasm of the cells b. HLA class I antigens are expressed on all cells with nuclei c. HLA class II antigens presents ... on chromosome 6 e. HLA tissue typing is carried out in all forms of transplantation to prevent rejection

Last Answer : HLA class I antigens are expressed on all cells with nuclei

In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Description : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Last Answer : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. ... will A. 10 J B. 15 J C. 25 J D. 40 J

In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Description : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Last Answer : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. ... (2) A` C. `20sqrt(3) A` D. `12sqrt(6) A`

In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Description : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. Switch S is closed at time t=D. Suppose at som

Last Answer : In the figure shown `C_(1)=1F, C_(2)=2F and L=5H`. Initially `C_(1)` is charged 50V and `C_(2)` to 10V. ... ` B. `15sqrt(2) A` C. `10 A` D. `20 A`

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time (A) t = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s

Description : A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The ... = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s

Last Answer : (D) t = 800 s

Let a pair of fair coins be tossed. Here S = {HH, HT, TH, TT}. Consider the events A = {heads on the first coin} = {HH, HT}, -Maths 9th

Description : Let a pair of fair coins be tossed. Here S = {HH, HT, TH, TT}. Consider the events A = {heads on the first coin} = {HH, HT}, -Maths 9th

Last Answer : ThenP (A) = P (B) = P (C) = \(rac{2}{4}\) = \(rac{1}{2}\) andP (A ∩ B) = P ({HH}) = \(rac{1}{4}\), P (A ∩ C) = P ({HT}) = \(rac{1}{4}\)P ( ... C)Thus condition (i) is satisfied, i.e., the events are pairwise independent. But condition (ii) is not satisfied and so the three events are not independent

Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._(2)He^(4) to ._(90)Th^(231)` `{:(e = 92, e = 0, e = 90),(p = 92,

Description : Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._(2)He^(4) to ._(90)Th^(231)` `{:(e = 92, e = 0, e = 90),(p = 92,

Last Answer : Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._( ... evolve energy C. annihilation D. absorption in the nucleus

Ajay and vivek are active partner in a particular work. Ajay receive 1/7th of the capital for 84 months and vivek receives 1/8 th of the profit, for how long vivek amount was used? a) 11 b) 8. C) 4 d) 2

Description : Ajay and vivek are active partner in a particular work. Ajay receive 1/7th of the capital for 84 months and vivek receives 1/8 th of the profit, for how long vivek amount was used? a) 11 b) 8. C) 4 d) 2 

Last Answer : Answer: D) Let total profit be A. Profit earned by vivek =1/8*A. Profit earned by Ajay =7/8 *A Ratio of vivek & Ajay =1:7 Let total capital investment be Z Ajay receive 1/7th of Z for 84 months Vijay receive 6/7th of Z for Y months 7/1=(1/7*Z*84)/(6/7*Z*Y) => Y = 2month 

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt, (a) 25% will be tall with red fruit (b) 50% will be tall with red fruit (c) 75% will be tall with red fruit (d) all the offspring will be tall with red fruit

Description : In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt, (a) 25% will be ... with red fruit (c) 75% will be tall with red fruit (d) all the offspring will be tall with red fruit

Last Answer : (b) 50% will be tall with red fruit

The cells without nuclei are present in

Description : The cells without nuclei are present in

Last Answer : The cells without nuclei are present in A. Vascular cambium B. Root hair C. Comkpanion cell D. Members of seive tube

What is the average life of a radioactive atom having a 'half life period' of T? (A) 1.44 T (B) 0.144 T (C) 14.4 T (D) 2T

Description : What is the average life of a radioactive atom having a 'half life period' of T? (A) 1.44 T (B) 0.144 T (C) 14.4 T (D) 2T

Last Answer : (A) 1.44 T

The elements with filled electron shells are called _______ a. Inert Elements. b. Active Elements. c. Radioactive Elements. d. Bonded Electrons.

Description : The elements with filled electron shells are called _______ a. Inert Elements. b. Active Elements. c. Radioactive Elements. d. Bonded Electrons.

Last Answer : d. Bonded Electrons.

Radon differs from other naturally radioactive elements in which one of the following ways. Is it because radon w) is extremely radioactive x) decays into the element radium y) is a noble gas z) is as chemically active as fluorine

Description : Radon differs from other naturally radioactive elements in which one of the following ways. Is it because radon w) is extremely radioactive x) decays into the element radium y) is a noble gas z) is as chemically active as fluorine

Last Answer : ANSWER: Y -- IS A NOBLE GAS

Can anyone help me with this? Chlorine and carbon monoxide gases are mixed in a 1.00L container and the following equilibrium is established: CO(g) + Cl2(g) <--> COCl2(g).. Initially 1.5 mol of chlorine was present with excess carbon monoxide. At equilibrium, 0.8 mol of COCl2(g) was found. How do you calculate the percent reaction?

Description : Can anyone help me with this? Chlorine and carbon monoxide gases are mixed in a 1.00L container and the following equilibrium is established: CO(g) + Cl2(g) COCl2(g).. Initially 1.5 mol of ... monoxide. At equilibrium, 0.8 mol of COCl2(g) was found. How do you calculate the percent reaction?

Last Answer : For a start, your equation isn't balanced; it should be Cl2 (Cl2, not 2Cl, because of HONClBrIF). Given this, if we assume the reaction goes to completion, 1.5 mol Cl2 will produce 1.5 mol ... .3% Incidentally, is that supposed to be CO or Co? It has no effect on the calculation, just curious.

Proteins that are secreted by cells are generally a. not synthesized on membrane-bound ribosomes b. initially synthesized with a signal peptide or leader sequence at their C terminal c. found in vesicles and secretory granules d. moved across the cell membranes by endocytosis e. secreted in a form that is larger than the form present in the endoplasmic reticulum

Description : Proteins that are secreted by cells are generally a. not synthesized on membrane-bound ribosomes b. initially synthesized with a signal peptide or leader sequence at their C terminal c. found in ... endocytosis e. secreted in a form that is larger than the form present in the endoplasmic reticulum

Last Answer : found in vesicles and secretory granules

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are: (A) 1 (B) 2 (C) 3 (D) 0

Description : The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are: (A) 1 (B) 2 (C) 3 (D) 0

Last Answer : (B) 2

The following proportion of the total body calcium is present in bones and teeth: (A) 75% (B) 90% (C) 95% (D) 99%

Description : The following proportion of the total body calcium is present in bones and teeth: (A) 75% (B) 90% (C) 95% (D) 99%

Last Answer : Answer : D

For a B-tree of height h and degree t, the total CPU time used to insert a node is (A) O(h log t) (B) O(t log h) (C) O(t2h) (D) O(th)

Description : For a B-tree of height h and degree t, the total CPU time used to insert a node is (A) O(h log t) (B) O(t log h) (C) O(t2h) (D) O(th)

Last Answer : (D) O(th)

. The half life period of a radioactive element depends upon the (A) Temperature (B) Pressure (C) Amount of element present (D) None of these

Description : . The half life period of a radioactive element depends upon the (A) Temperature (B) Pressure (C) Amount of element present (D) None of these

Last Answer : (D) None of these

What describ happens in th Main Sequence star th blws th nebula around it awy Describ the diferences betwen the T-Tauri and the Main Sequence in terms of which has a higher temperatur, how is their spectrm diferent, and what forces are actin on each objec?

Description : What describ happens in th Main Sequence star th blws th nebula around it awy Describ the diferences betwen the T-Tauri and the Main Sequence in terms of which has a higher temperatur, how is their spectrm diferent, and what forces are actin on each objec?

Last Answer : Sorry for the bad spelling, had to take a few characters out for the question to fit in

__ is defined as th ned as the use of c e use of commercial ma cial marketing concep ng concepts and t ts and tools in ools in programs designed to influence individual’s behavior to designed to influence individual’s behavior to improve their well-being and that of ove their well-being and that of society. a. Unsought product b. Internal marketing Internal marketing c. Social marketing d. Product line

Description : __ is defined as th ned as the use of c e use of commercial ma cial marketing concep ng concepts and t ts and tools in ools in programs designed to influence individual's behavior to ... of society. a. Unsought product b. Internal marketing Internal marketing c. Social marketing d. Product line

Last Answer : c. Social marketing

R being the silent partner contributes 2/9 th of profit and the remaining is divided between S and T in the ratio of 7:5. If the difference between the profit shares of R and T is Rs.6600. What is the S’s share? a) 27900 b) 28000 c) 29400 d) 26889

Description : R being the silent partner contributes 2/9 th of profit and the remaining is divided between S and T in the ratio of 7:5. If the difference between the profit shares of R and T is Rs.6600. What is the S’s share? a) 27900 b) 28000 c) 29400 d) 26889

Last Answer : Answer: C) Let total profit be x R’s share =2/9*x Balance share =7/9 *x Share of T=7/9 *x*5/12=35/108*x Difference of R &T is, 35/108*X-2/9 *x=6600=>x=64,800 Share of S =7/9*64800*7/12 =Rs.29400.

A radioactive substance (parent) decays to its daughter element . The age of radioactive substance (t) is related to the daughter (d)/parent (p) ratio

Description : A radioactive substance (parent) decays to its daughter element . The age of radioactive substance (t) is related to the daughter (d)/parent (p) ratio

Last Answer : A radioactive substance (parent) decays to its daughter element . The age of radioactive substance (t) is related to ... /(lambda) In (2 + (D)/(P))`

When assisting the patient to interpret a negative HIV test result, the nurse informs the patient that the results mean a) his body has not produced antibodies to the AIDS virus. A negative test result indicates that antibodies to the AIDS virus are not present in the blood at the time the blood sample for the test is drawn.

Description : When assisting the patient to interpret a negative HIV test result, the nurse informs the patient that the results mean a) his body has not produced antibodies to the AIDS virus. A negative test ... When antibodies to the AIDS virus are detected in the blood, the test is interpreted as positive.

Last Answer : a) his body has not produced antibodies to the AIDS virus. A negative test result indicates that antibodies to the AIDS virus are not present in the blood at the time the blood sample for the test is drawn.

Read the assertion and reason carefully to mark the correct option out of the option given below: Assertion: Thick layers of muscles are present in th

Description : Read the assertion and reason carefully to mark the correct option out of the option given below: Assertion: Thick layers of muscles are present in th

Last Answer : Read the assertion and reason carefully to mark the correct option out of the option given below: Assertion: Thick ... D. Both (A) of (R ) are false.

The total number of electrons present in `4^"th"` shell of Astatatine (`._85At`) are:

Description : The total number of electrons present in `4^"th"` shell of Astatatine (`._85At`) are:

Last Answer : The total number of electrons present in `4^"th"` shell of Astatatine (`._85At`) are:

A Bill referred to a 'Joint Sitting' of the two Houses of the Parliament is required to be passed by – (1) a simple majority of the members present (2) absolute majority of the total membership (3) rd majority of the members present (4) (4) th majority of the members present

Description : A Bill referred to a 'Joint Sitting' of the two Houses of the Parliament is required to be passed by – (1) a simple majority of the members present (2) absolute majority of the total membership (3) rd majority of the members present (4) (4) th majority of the members present

Last Answer : (1) a simple majority of the members present Explanation: In matters pertaining to nonfinancial (ordinary) bills, after the bill has been passed by the House where it was originally tabled (Lok Sabha or ... both Houses, presided over by the speaker of the Lok Sabha and decided by a simple majority.

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16

Description : A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16

Last Answer : (D) 16

Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. (A) 18 (B) 24 (C) 6 (D) 12

Description : Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. (A) 18 (B) 24 (C) 6 (D) 12

Last Answer : (B) 24

If two samples are different in size, like 20 to 60, is it a good idea to apply two sample t-tests and chi-square tests?

Description : If two samples are different in size, like 20 to 60, is it a good idea to apply two sample t-tests and chi-square tests?

Last Answer : answer:If the data is continuous (or close to it), then I would use this version of the two-sample t-test. You would not have to downsize the sample. The number of degrees of freedom is hard to ... you can use the smaller sample size, minus one, as a conservative estimate. In this case, df > 19.

If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio 1 : 8. This indicates t

Description : If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio 1 : 8. This indicates t

Last Answer : If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen ... proportion C. Reciprocal proportions D. None of these