Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half Reason (R ) : Half life of radioactive iso

Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half Reason (R ) : Half life of radioactive iso
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Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half ... . If both (A) and (R ) are incorrect.
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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

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

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

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

Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element disinegrates, more of it is formed in nat

Description : Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element disinegrates, more of it is formed in nat

Last Answer : Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element ... . If both (A) and (R ) are incorrect.

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

(A) The archaeological studies are based on the radioactive decay of carbon-14 isotope. (R ) The ratio of C-14 to C-12 in the animals of plants is the

Description : (A) The archaeological studies are based on the radioactive decay of carbon-14 isotope. (R ) The ratio of C-14 to C-12 in the animals of plants is the

Last Answer : (A) The archaeological studies are based on the radioactive decay of carbon-14 isotope. (R ) The ratio of C ... D. If both (A) and (R ) are incorrect.

What type of decay involves only the release of high-energy photons and therefore does not change the mass of an atom of a radioactive isotope?

Description : What type of decay involves only the release of high-energy photons and therefore does not change the mass of an atom of a radioactive isotope?

Last Answer : High-energy photons are gamma rays; the decay is called gamma decay. Please note that the mass of an atom DOES change, since a loss of energy is accompanied by a loss in mass.

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.

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

A radioactive isotope undergoes decay with respect to time following __________ law. (A) Logarithmic (B) Exponential (C) Linear (D) Inverse square

Description : A radioactive isotope undergoes decay with respect to time following __________ law. (A) Logarithmic (B) Exponential (C) Linear (D) Inverse square

Last Answer : (B) Exponential

The radioactive isotope of hydrogen is called--------- and its nucleus contains --------proton and --- --neutron.

Description : The radioactive isotope of hydrogen is called--------- and its nucleus contains --------proton and --- --neutron.

Last Answer : Ans: Tritium, one and two

Is the decay of a radioactive isotope predictable (causally determined) or not?

Description : Is the decay of a radioactive isotope predictable (causally determined) or not?

Last Answer : At this point it seems to be a result of quantum indeterminacy. In other words, since the Heisenberg uncertainty principle is in effect at that level, all we can determine is probability (hence a predictable ... , it is deterministic and we will (hopefully) one day be able to understand it as such.

The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On 1st July, 2006, it was found that only 0.

Description : The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On 1st July, 2006, it was found that only 0.

Last Answer : The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On ... days B. 30 days C. 25 days D. 50 days

Which radioactive isotope is used to detect tumours?

Description : Which radioactive isotope is used to detect tumours?

Last Answer : Which radioactive isotope is used to detect tumours? A. `.^(74)As` B. `.^(24)Na` C. `.^(131)I` D. `.^(60)Co`

When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus `._(15)^(30)P` with the emission of …. Is formed

Description : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus `._(15)^(30)P` with the emission of …. Is formed

Last Answer : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus ` ... A. neutrons B. protons C. positrons D. electrons

When an isotope is blank it is radioactive?

Description : When an isotope is blank it is radioactive?

Last Answer : When an isotope is unstable, it is said to be radioactive.

When does an isotope undergo radioactive decay?

Description : When does an isotope undergo radioactive decay?

Last Answer : An atom of a given isotope will undergo radioactive decay whenever it feels like it. No joke. The nucleus of a radioactive isotope is unstable. Always. But that atom has no predictable moment ... to decay, except that those with very short half lives will pretty much disappear relatively quickly.

A radioactive isotope labeled cDNA probe is used in (A) Southern blotting (B) Northern blotting (C) Both (A) and (B) (D) None of these

Description : A radioactive isotope labeled cDNA probe is used in (A) Southern blotting (B) Northern blotting (C) Both (A) and (B) (D) None of these

Last Answer : Answer : C

Which one is the radioactive isotope of hydrogen? (A) Deuterium (B) Ortho-hydrogen (C) Tritium (D) None of these

Description : Which one is the radioactive isotope of hydrogen? (A) Deuterium (B) Ortho-hydrogen (C) Tritium (D) None of these

Last Answer : (C) Tritium

Radioactive isotope of Uranium used in Nuclear Bomb is ? A.92 U 235 (Answer) B.92 U 234 C. 92 U 233 D. 92 U 238

Description : Radioactive isotope of Uranium used in Nuclear Bomb is ? A.92 U 235 (Answer) B.92 U 234 C. 92 U 233 D. 92 U 238

Last Answer : A.92 U 235 (Answer)

Which technique has helped in investigation of Calvin cycle? (a) X-ray crystallography (b) X-ray technique (c) Radioactive isotope technique (d) Intermittent light

Description : Which technique has helped in investigation of Calvin cycle? (a) X-ray crystallography (b) X-ray technique (c) Radioactive isotope technique (d) Intermittent light

Last Answer : (c) Radioactive isotope technique

Which of the following is the same for both radioactive iodine and stable iodine? w) number of neutrons x) mass number y) half-life z) chemical properties

Description : Which of the following is the same for both radioactive iodine and stable iodine? w) number of neutrons x) mass number y) half-life z) chemical properties

Last Answer : ANSWER: Z -- CHEMICAL PROPERTIES

Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are always present inside the nucleus.

Description : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are always present inside the nucleus.

Last Answer : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are ... both (A) and (R ) are incorrect.

Assertion A: Large size stones are required in stone revetment in shore protection. Reason R: Resistance of stone to wave force is proportional to its volume and wave force is proportional to the exposed area of the stone. Select your answer based on the coding system given below. (A) Both A and R is true and R is the correct explanation of A (B) Both A and R is true but R is not a correct explanation of A (C) A is true but R is false (D) A is false but R is true

Description : Assertion A: Large size stones are required in stone revetment in shore protection. Reason R: Resistance of stone to wave force is proportional to its volume and wave force is proportional to the exposed area of the stone. ... of A (C) A is true but R is false (D) A is false but R is true

Last Answer : (A) Both A and R is true and R is the correct explanation of A

The half - life of a radioactive substance depends upon (a) Its temperature (b) The external pressure (c) The mass of the substance (d) The strength of the nuclear force between the nucleons its atoms

Description : The half - life of a radioactive substance depends upon (a) Its temperature (b) The external pressure (c) The mass of the substance (d) The strength of the nuclear force between the nucleons its atoms

Last Answer : Ans:(d)

A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, the process is called `alpha`-decay (

Description : A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, the process is called `alpha`-decay (

Last Answer : A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, ... 4 C. 1,3, and 4 D. 1,2, and 4

Assertion (A) : Mass media promote a culture of violence in the society. Reason (R) : Because violence sells in the market as people themselves are violent in character. (A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) Both (A) and (R) are false.

Description : Assertion (A) : Mass media promote a culture of violence in the society. Reason (R) : Because violence sells in the market as people themselves are violent in character. (A) Both (A) and (R) are true and (R) is the correct ... ). (C) (A) is true, but (R) is false. (D) Both (A) and (R) are false.

Last Answer : (D) Both (A) and (R) are false.

Give reason: Radioactive material of longer half life is dangerous.

Description : Give reason: Radioactive material of longer half life is dangerous.

Last Answer : Since the radioactivity lasts longer.

Assertion A: Depth and width required at the entrance to a harbour are more than those required in the channel. Reason R: The entrance to a harbour is usually more exposed to waves as compared to the harbour itself. Select your answer based on the coding system given below: (A) Both A and R is true and R is the correct explanation of A (B) Both A and R is true but R is not the correct explanation of A (C) A is true but R is false (D) A is false but R is true

Description : Assertion A: Depth and width required at the entrance to a harbour are more than those required in the channel. Reason R: The entrance to a harbour is usually more exposed to waves as compared to the harbour itself. ... explanation of A (C) A is true but R is false (D) A is false but R is true

Last Answer : (A) Both A and R is true and R is the correct explanation of A

What is the half-life of carbon 12 isotope ?

Description : What is the half-life of carbon 12 isotope ?

Last Answer : Carbon -12 is a normal atom. It is not radioactive. C- 14 is radioactive. Its half -life is 5,630 years

The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample of 500 mg of `.^(60)Co` to disintegrate?

Description : The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample of 500 mg of `.^(60)Co` to disintegrate?

Last Answer : The `.^(60)C` isotope decays with a half life of 5.3 years. How long would it take for 7/8 of a sample ... B. 15.9 years C. 10.6 years D. 5.3 years

What fraction of an original sample of a radio isotope remains after 3 half-life periods?

Description : What fraction of an original sample of a radio isotope remains after 3 half-life periods?

Last Answer : One eighth remains.

What fraction of an original sample of a radio isotope remains after 3 half-life periods?

Description : What fraction of an original sample of a radio isotope remains after 3 half-life periods?

Last Answer : One eighth remains.

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

Fifty micrograms of an isotope have decayed to 12.5 micrograms after 12 hours. What is the half life of the radioisotope?

Description : Fifty micrograms of an isotope have decayed to 12.5 micrograms after 12 hours. What is the half life of the radioisotope? 

Last Answer : ANSWER: SIX HOURS

Assertion (A): Learning is a life long process. Reason (R): Learning to be useful must be linked with life processes. Choose the correct Answer from the following code (A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true.

Description : Assertion (A): Learning is a life long process. Reason (R): Learning to be useful must be linked with life processes. Choose the correct Answer from the following code (A) Both (A) and (R) are true and (R) is the correct ... (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true.

Last Answer : Answer: B

Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. Reason `:-` ANF can cause vasodilation and decrease the B

Description : Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. Reason `:-` ANF can cause vasodilation and decrease the B

Last Answer : Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. ... False. D. If both Assertion & Reason are false.

Assertion `:` Myocardial infarction oftern results from a sudden decrease in coronary blood supply resulting in decreased oxygen supply. Reason `:` Th

Description : Assertion `:` Myocardial infarction oftern results from a sudden decrease in coronary blood supply resulting in decreased oxygen supply. Reason `:` Th

Last Answer : Assertion `:` Myocardial infarction oftern results from a sudden decrease in coronary blood supply ... If both Assertion & Reason are false.

Assertion : If by mistake, a voltmeter is connected in series, then circuit will burn. Reason : Current will drastically decrease in the circuit.

Description : Assertion : If by mistake, a voltmeter is connected in series, then circuit will burn. Reason : Current will drastically decrease in the circuit.

Last Answer : Assertion : If by mistake, a voltmeter is connected in series, then circuit will burn. Reason : ... D. If Assertion is false but Reason is true.

The atomic number of uranium is 92 and its atomic mass is 238.how many neutrons does the most common isotope of uranium have.?

Description : The atomic number of uranium is 92 and its atomic mass is 238.how many neutrons does the most common isotope of uranium have.?

Last Answer : The most common isotope of uranium is uranium-238 with 146 neutrons.

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is?

Description : An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is?

Last Answer : Mass number = proton number + neutron number SO, Mass number(Aluminium) = 13+ 14 =27

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is?

Description : An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is?

Last Answer : Mass number = proton number + neutron number SO, Mass number(Aluminium) = 13+ 14 =27

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

If an isotope of silicon has 15 neutrons what is the mass number?

Description : If an isotope of silicon has 15 neutrons what is the mass number?

Last Answer : Need answer

What is the mass number of this isotope?

Description : What is the mass number of this isotope?

Last Answer : I cannot answer this question.

Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ): Number of organisms at any trophic level depends

Description : Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ): Number of organisms at any trophic level depends

Last Answer : Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ... . D. If both assertion and reason are false.

Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ): Number of organisms at any trophic level depends

Description : Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ): Number of organisms at any trophic level depends

Last Answer : Assertion (A) : In a food chain members of successive higher levels are fewer in number. Reason (R ... . D. If both assertion and reason are false.

Assertion (A) :The liability of share holders in a private limited company is limited to the amount. Reason (R) :The number of share holders of a private limited company is limited to fifty. A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not a correct explanation of A C. A is true but R is false D. A is false but R is true

Description : Assertion (A) :The liability of share holders in a private limited company is limited to the amount. Reason (R) :The number of share holders of a private limited company is limited to fifty. A. Both A and R are ... correct explanation of A C. A is true but R is false D. A is false but R is true

Last Answer : D. A is false but R is true