Initial amount of the radioactive element with half life 10 days is 16 g. What amount in gm of this element will remain after 40 days?

Initial amount of the radioactive element with half life 10 days is 16 g. What amount in gm of this element will remain after 40 days?
by

1 Answer

Answer :

Initial amount of the radioactive element with half life 10 days is 16 g. What amount in gm of this element will remain after 40 days?
by
selected by

Related questions

The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm. (A) 1/4 (B) 1/8 (C) 1/2 (D) 1/16

Description : The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm. (A) 1/4 (B) 1/8 (C) 1/2 (D) 1/16

Last Answer : (D) 1/16

A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial activity is ten times the permissible val

Description : A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial activity is ten times the permissible val

Last Answer : A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial ... B. 1000 days C. 300 days D. 10 days

A radioactive isotope having a half life of 3 days was received after 12 days. It was found that there were 3 gm of the isotopes in the container. The

Description : A radioactive isotope having a half life of 3 days was received after 12 days. It was found that there were 3 gm of the isotopes in the container. The

Last Answer : A radioactive isotope having a half life of 3 days was received after 12 days. It was found that there were 3 gm of ... 48 g B. 36 g C. 24 g D. 12 g

The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg? A. 4 days B. 12 days C. 16 days D. 8 days (Answer) E. None of these

Description : The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg? A. 4 days B. 12 days C. 16 days D. 8 days (Answer) E. None of these

Last Answer : D. 8 days (Answer)

The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining undecayed after 18 hr is a)12 g b)

Description : The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining undecayed after 18 hr is a)12 g b)

Last Answer : The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining ... 4 g B. 8 g C. 12 g D. 16 g

A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight...

Description : A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier  (a) 600 g (b) 1000 g (c) 1250 g (d) 2000 g 

Last Answer : Half life = 10days  The formula which is, 1/(2)^n × original weight = Weight left today.  To obtain the value of n = divide no of days by half life ie.,n= 40/10= 4 n=4 So, 1/(2)^n × original Weight = 125g 1/(2)^4 × Original weight = 125 Original weight = 16×125 = 2000g

The `t_(1//2)` of a radionuclide is 8 hours. Starting with 40 g of the isotope, the amount in gm remainig after one day will be:

Description : The `t_(1//2)` of a radionuclide is 8 hours. Starting with 40 g of the isotope, the amount in gm remainig after one day will be:

Last Answer : The `t_(1//2)` of a radionuclide is 8 hours. Starting with 40 g of the isotope, the amount in gm remainig after one day will be:

The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. (A) 1/2 (B) 1/4 (C) 1/8 (D) 1/16

Description : The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. (A) 1/2 (B) 1/4 (C) 1/8 (D) 1/16

Last Answer : (D) 1/16

Pick out the wrong statement. (A) α-particle emission from a radioactive element makes it electrically negative (B) β-particle emission from a radioactive element makes it electrically positive (C) A radioactive element having a half life period of 20 years will completely disintegrated in 40 years (D) The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

Description : Pick out the wrong statement. (A) α-particle emission from a radioactive element makes it electrically negative (B) β-particle emission from a radioactive element makes it electrically ... ) The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

Last Answer : (C) A radioactive element having a half life period of 20 years will completely disintegrated in 40 years

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

The physical half life of radioactive 131I is: A. 8 hours B. 8 days C. 16 days D. 60 day

Description : The physical half life of radioactive 131I is: A. 8 hours B. 8 days C. 16 days D. 60 day

Last Answer : . 8 days

The half life period of a radioactive element depends on its (A) Temperature (B) Pressure (C) Amount (D) None of these

Description : The half life period of a radioactive element depends on its (A) Temperature (B) Pressure (C) Amount (D) None of these

Last Answer : (D) None of these

. 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

If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days. (A) 5 (B) 10 (C) 20 (D) 30

Description : If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days. (A) 5 (B) 10 (C) 20 (D) 30

Last Answer : (B) 10

A radioactive element `X`, decays by the sequence and with half-lives, given below, `X underset(30"min")overset(alpha)(rarr) Y underset(2"days")overse

Description : A radioactive element `X`, decays by the sequence and with half-lives, given below, `X underset(30"min")overset(alpha)(rarr) Y underset(2"days")overse

Last Answer : A radioactive element `X`, decays by the sequence and with half-lives, given below, `X underset(30"min" ... D. The mass number of Y is greater than X

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a GeigerMuller counter from its known quantity. If the half life period of aradioactive substance is one month, then(A) 3/4th of it will disintegrate in two months(B) It will completely disintegrate in two months(C) It will completely disintegrate in four months(D) 1/8th of it will remain intact at the end of four months

Description : The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a GeigerMuller counter from its known quantity. If the half life period of a ... in four months (D) 1/8th of it will remain intact at the end of four months

Last Answer : (B) It will completely disintegrate in two months

A radioisotope has a half life of 10 days. If today there is `125 g ` of it left, what was its mass 40 days earlier ? a)600g b)1000g c)1250g d)2000g

Description : A radioisotope has a half life of 10 days. If today there is `125 g ` of it left, what was its mass 40 days earlier ? a)600g b)1000g c)1250g d)2000g

Last Answer : A radioisotope has a half life of 10 days. If today there is `125 g ` of it left, what was its mass ... d)2000g A. 600g B. 1000g C. 1250g D. 2000g

If you start with 24 grams of a radioactive element with a half-life of one month, how many grams of the radioactive element will be left after 2 months? w) 1.5 grams x) 3 grams y) 6 grams z) 12 grams

Description : If you start with 24 grams of a radioactive element with a half-life of one month, how many grams of the radioactive element will be left after 2 months? w) 1.5 grams x) 3 grams y) 6 grams z) 12 grams

Last Answer : ANSWER: Y -- 6 GRAMS

What is the half-life of a radioactive element ?

Description : What is the half-life of a radioactive element ?

Last Answer : Half-life is the amount of time during which half of the nucleus of an element is irradiated.

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

The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years. (A) 24 (B) 18 (C) 6 (D) 36

Description : The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years. (A) 24 (B) 18 (C) 6 (D) 36

Last Answer : (B) 18

A task was assigned to P, Q and R to be completed by not more than seven days. P alone can complete the task in ten days. Q alone can complete the task in twelve days and R alone can complete the task in fifteen days. All three of them worked for two days and P and Q together worked for another two days. What portion of the task will remain after four days? a) 3/10 b) 1/15 c) 1/9 d) 5/16 e) None of these

Description : A task was assigned to P, Q and R to be completed by not more than seven days. P alone can complete the task in ten days. Q alone can complete the task in twelve days and R alone can complete the task in fifteen days. ... will remain after four days? a) 3/10 b) 1/15 c) 1/9 d) 5/16 e) None of these

Last Answer : 1day's work of (P + Q+ R) = 1/10 + 1/12 +1/15 = 15/60 2 day's work of (P + Q+ R) = 15/60 × 2 = 1/2 1 day's work of (P+Q) = 1/10 +1/12 = 11/60 2 day's work of (P+Q) = 11/60 × 2 = 11/30 Rem. work of 4 days = 1- 1/2 + 11/30 = 2/15 Answer: e)

6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant? (A) 100% (B) 95% (C) 75% (D) 20%

Description : 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant? (A) 100% (B) 95% (C) 75% (D) 20%

Last Answer : (B) 95%

The radioactive element most commonly detected in humans is: w) potassium-40 x) cobalt-60 y) iodine-131 z) plutonium-238

Description : The radioactive element most commonly detected in humans is: w) potassium-40 x) cobalt-60 y) iodine-131 z) plutonium-238

Last Answer : ANSWER: W -- POTASSIUM-40

How much cesium Half-Life2 years would remain from a 10 G sample?

Description : How much cesium Half-Life2 years would remain from a 10 G sample?

Last Answer : Need answer

The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: w) 0.312 grams x) 0.625 grams y) 1.25 grams z) 2.50 grams

Description : The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: w) 0.312 grams x) 0.625 grams y) 1.25 grams z) 2.50 grams

Last Answer : ANSWER: X -- 0.625 GRAMS

The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 mg , how many milligrams of it would

Description : The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 mg , how many milligrams of it would

Last Answer : The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 ... A. 1 mg B. 2 mg C. 4 mg D. 8 mg

If the half-life of a radioisotope is 2 days, after how many days is the quantity reduced to 12.5% of its original amount? w) 4 days x) 6 days y) 8 days z) 10 days

Description : If the half-life of a radioisotope is 2 days, after how many days is the quantity reduced to 12.5% of its original amount? w) 4 days x) 6 days y) 8 days z) 10 days

Last Answer : ANSWER: X -- 6 DAYS

If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period

Description : If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period

Last Answer : B. Its clearance value will remain constant

If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period

Description : If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period

Last Answer : B. Its clearance value will remain constant

Consider the following decay series: `A to B to C to D` Where, A,B and C are radioactive elements with half lives of 4,5 sec, 15 days and 1 sec respec

Description : Consider the following decay series: `A to B to C to D` Where, A,B and C are radioactive elements with half lives of 4,5 sec, 15 days and 1 sec respec

Last Answer : Consider the following decay series: `A to B to C to D` Where, A,B and C are radioactive elements with half ... mol of C, 1/4 mol of D and noen of A

Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time requiredto reduce the concentration of reactant from 100 gm moles/litre to 50 gmmoles/litre is same as that required to reduce it from 2 gm moles/litre to 1gm mole/litre in the same volume. Then the order of this reaction is:(A) 0(B) 1(C) 2(D) 3

Description : Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time required to ... Then the order of this reaction is: (A) 0 (B) 1 (C) 2 (D) 3

Last Answer : (B) 1

When nucleus of an electrically neutral atom undergoes a radioactive decay process, it will remain neutral after the decay if the process is (a) An `a

Description : When nucleus of an electrically neutral atom undergoes a radioactive decay process, it will remain neutral after the decay if the process is (a) An `a

Last Answer : When nucleus of an electrically neutral atom undergoes a radioactive decay process, it will remain neutral ... a`gamma`-decay D. a K-capture process

Which of the following statement(s) is/are true concerning the management of a patient with hemophilia A undergoing an elective surgical operation? a. Concentrates of factor VIII should be given several days prior to elective surgery b. The half-life of factor VIII concentrates is less than 24 hours c. A dose of 40–50 IU/kg of factor VIII concentrate should be given prior to the planned surgical procedure d. Factor VIII concentration administration should be given for the first 24 hours after surgery but may then be stopped if no abnormal bleeding has been observed e. A new recombinant preparation of factor VIII offers the advantage of being virus-free

Description : Which of the following statement(s) is/are true concerning the management of a patient with hemophilia A undergoing an elective surgical operation? a. Concentrates of factor VIII should be given ... observed e. A new recombinant preparation of factor VIII offers the advantage of being virus-free

Last Answer : Answer: b, c, e Although the half-life of factor VIII is 2.9 days in normal individuals, the half-life of factor VIII concentrates is 9 to l8 hours. Levels of 80% to ... infection in the hemophilia population. A new recombinant preparation of factor VIII offers the advantage of being virus-free

Normal value of plasma total proteins varies between (A) 3–4 gm/100ml (B) 6–8 gm/100ml (C) 10–12 gm/100ml (D) 14–16 gm/100ml

Description : Normal value of plasma total proteins varies between (A) 3–4 gm/100ml (B) 6–8 gm/100ml (C) 10–12 gm/100ml (D) 14–16 gm/100ml

Last Answer : Answer : B

At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is

Description : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is

Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) ... B. 3 yrs C. 3.3 yrs D. None of these

At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is

Description : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is

Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : ... . 4.65 yrs C. 5.46 yrs D. 5.64 yrs

How many atoms are present in one gm-atom of an element? (A) 2 × 10 23 (B) 6 × 10 23 (C) 6 × 10 32 (D) 5 × 10 5

Description : How many atoms are present in one gm-atom of an element? (A) 2 × 10 23 (B) 6 × 10 23 (C) 6 × 10 32 (D) 5 × 10 5

Last Answer : (B) 6 × 10 23

If you had 100 gram of lawrencium how much would it remain in 40 days?

Description : If you had 100 gram of lawrencium how much would it remain in 40 days?

Last Answer : Need answer

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

If the temperature is increased the amount of SO3(g) produced will: A increase. B decrease. C remain the same.

Description : If the temperature is increased the amount of SO3(g) produced will: A increase. B decrease. C remain the same.

Last Answer : B decrease.

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)`

The total amount of copper in the body of an average adult is (A) 1 gm (B) 500 mg (C) 100 mg (D) 10 mg

Description : The total amount of copper in the body of an average adult is (A) 1 gm (B) 500 mg (C) 100 mg (D) 10 mg

Last Answer : Answer : C

The total amount of calcium in an average adult man is about (A) 100 gm (B) 500 gm (C) 1 kg (D) 10 kg

Description : The total amount of calcium in an average adult man is about (A) 100 gm (B) 500 gm (C) 1 kg (D) 10 kg

Last Answer : Answer : C

In a singly reinforced beam (A) Compression is borne entirely by concrete (B) Steel possesses initial stresses when embedded in concrete (C) Plane sections transverse to the centre line of the beam before bending remain plane after bending (D) Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

Description : In a singly reinforced beam (A) Compression is borne entirely by concrete (B) Steel possesses initial stresses when embedded in concrete (C) Plane sections transverse to the centre line ... Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

Last Answer : Answer: Option C

The application of elastic theory to the beams is based on the assumption that (a) At any cross-section, plane sections before bending remain plane after bending (b) All tensile stresses are taken up by reinforcement alone and none by the concrete. (c) Steel reinforcement is free from initial stresses when it is embedded in concrete. (d) All of the above

Description : The application of elastic theory to the beams is based on the assumption that (a) At any cross-section, plane sections before bending remain plane after bending (b) All tensile stresses are taken ... reinforcement is free from initial stresses when it is embedded in concrete. (d) All of the above

Last Answer : (d) All of the above

In β-decay of radioactive material, the ratio of neutron to proton (A) Increases (B) Remain same (C) Decreases (D) Is unpredictable; may increase or decrease

Description : In β-decay of radioactive material, the ratio of neutron to proton (A) Increases (B) Remain same (C) Decreases (D) Is unpredictable; may increase or decrease

Last Answer : (C) Decreases

The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2 /gm. (A) 800 (B) 1600 (C) 4000 (D) 8500

Description : The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2 /gm. (A) 800 (B) 1600 (C) 4000 (D) 8500

Last Answer : (B) 1600

What is the half life of 3 g sample of radioisotope that decay to 0.75 g in 30 days?

Description : What is the half life of 3 g sample of radioisotope that decay to 0.75 g in 30 days?

Last Answer : 15 days