# Atoms and Nuclei-Radioactive Decay Law (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 6 of 6

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## 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 is 1.3 ⨯ 10 -12.

## Question number: 1 (1 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: 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

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: 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 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

## Question number: 6

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2017

MCQ▾

### Question

Radioactive material has decay constant and material has decay constant . Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material to that will be ?

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page