Atoms and Nuclei-Radioactive Decay Law (NEET Physics): Questions 1 - 5 of 5

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2098 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

Passage

Read the passage given below and answer the questions that follow:

In a living organism, the quantity of C 14 is the same as in the atmosphere. But in organisms which are dead, no exchange takes place with the atmosphere and by measuring the decay rate of 14 C in the old bones or wood, the time taken for the activity to reduce to this level can be calculated. This gives the age of the wood or bone.

Given: T 1/2 for 14 C is 5370 years and the ratio of C14C12 is 1.3 ⨯ 10 -12.

Question number: 1 (1 of 3 Based on Passage) Show Passage

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

If in an old sample of wood of 10g the decay rate is 30 decays per minute, the age of the wood is

Choices

Choice (4) Response

a.

15300 years

b.

13310 years

c.

1000 years

d.

50 years

Question number: 2 (2 of 3 Based on Passage) Show Passage

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

The decay rate of 14 C in l gm of carbon in a living organism is,

Choices

Choice (4) Response

a.

25 Bq

b.

0.25 Bq

c.

2.5 Bq

d.

5 Bq

Question number: 3 (3 of 3 Based on Passage) Show Passage

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

The decay rate in another piece is found to be 0.30 Bq per gm then we can conclude,

Choices

Choice (4) Response

a.

The observed decay is not that of 14 C alone

b.

There is a statistical error

c.

he sample is very recent

d.

All a. , b. and c. are correct

Question number: 4

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

The half-life of radioactive Radon is 3.8 days. The time at the end of which 120th of the Radon sample will remain undecayedis

(Given log 10 e = 0.4343)

Choices

Choice (4) Response

a.

33 days

b.

3.8 days

c.

76 days

d.

16.5 days

Question number: 5

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

Half-life of Bi 210 is 5 days. If we start with 50, 000 atoms of this isotope, the number of atoms left over after 10 days is

Choices

Choice (4) Response

a.

5, 000

b.

25, 000

c.

20, 000

d.

12, 500

Sign In