A radioactive substance has a half life of four months, three-fourth of the substance would decay in

Which of the following statements are true?
1. All radioactive elements decay exponentially with time.
2. Half-life time of radioactive elements is the time required for one-half of the radioactive atoms to disintegrate.
3. Age of the earth can be determined by radioactive dating.
4. Half-life time of a radioactive element is fifty percent of its average life period.
Select the correct answer:

A

1 and 3

B

1, 3 and 4

C

1, 2 and 3

D

2 and 3

Which of the following statement regarding radioactive decay is correct? Average life equals to 1.44 of half-life. Half-life is directly proportional to decay constant. The decay of element is proportional to no of atoms or moles.

A

Statement (i) and (ii) are correct.

B

Statement (i) and (iii) are correct.

C

Statement (ii) and (iii) are correct.

D

All are correct.

A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in

A

3 months

B

4 months

C

8 months

D

12 months

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?

A

it will completely disintegrate in two months

B

l/8th of it will remain intact at the end of four months

C

3/4th of it will disintegrate in two months

D

it will completely disintegrate in four months

Find the probability that the nucleus of 87Ra221 undergoes decay after three half-lives if it’s a radioactive substance that has a half-life of 6 days.

A

1/6

B

5/6

C

7/8

D

1/2

Nuclear wastes is waste that contains radioactive material. Radioactive material is normally a by product of nuclear power generation. Radioactive waste is regulated by government agencies in order to protect human health and the environment. Radioactivity naturally decays over time, so radioactive waste has to be isolated and confined in appropriate disposal facilities for a sufficient period until it no longer poses a threat. Which of the following statements can be inferred from the paragraph?

A

Radioactive material is very expensive.

B

Since radioactive material decays over time, it is not hazardous.

C

Radioactive material is extremely hazardous to humans.

D

Disposal of radioactive material, is extremely difficult.

A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.

A

Six months

B

Ten months

C

Twelve Months

D

Twenty four months

Half life of a radioactive isotope corresponds to the time required for half of the following to decay

A

Electrons

B

Protons

C

Neutrons

D

Atom

The time required for half of the __________ of a radioactive isotope to decay is called its half life.

A

Nuclei

B

Electrons

C

Protons

D

Neutrons

A radioactive substance has a half life of four months, three-fourth of the substance would decay in

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