The activity of a sample of a radioactive material is A1, at time t1 and A2 at time t2 (t2>t1). If its mean life T, then 
(a) A1t1=A2t2            (b) A1-A2=t2-t1
(c) A2=A1et1-t2/T    (d) A2=A1et1/t2T

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Nucleus produced due to α-decay of the nucleus XZA is

(a) YZ+2A+4                     (b) YZA
(c) YZ-2A-4                     (d) YZ-4A-2

Concept Questions :-

Types of decay
Please attempt this question first.

Difficulty Level:


Which of the following processes represents a gamma-decay

(a) XZA+γXZ-1A+a+b 
(b) XZA+n01XZ-2A-3+c
(c) XZAXZA+f
(d) XZA+e-1  XZ-1A+g

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The half-life of At215 is 100 μs. The time taken for the radioactivity of a sample of At215 to decay to 1/16th of its initial value is 
(a) 400 μs               (b) 6.3 μs 
(c) 40 μs                 (d) 300 μs

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 116th part

(a) 12 h             (b) 16 h
(c) 48 h             (d) 192 h

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A radioactive substance has an average life of 5 hours. In a time of 5 hours 
(a) Half of the active nuclei decay
(b) Less than half of the active nuclei decay
(c) More than half of the active nuclei decay
(d) All active nuclei decay

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which of the following radiations has the least wavelength

(a) X-rays              (b) γ-rays
(c) β-rays              (d) α-rays

Concept Questions :-

Types of decay
Please attempt this question first.

Difficulty Level:


A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is 
(a) 0.8 In 2                (b) 0.4 In 2
(c) 0.2 In 2                (d) 0.1 In 2

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A nucleus with Z = 92 emits the following in a sequence:
α,β-,β-,α,α,α,α,α,β-,β-,α,β+,β+,α. The Z of the resulting nucleus is 
(a) 74              (b) 76
(c) 78              (d) 82

Concept Questions :-

Types of decay
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called 
(a) Gamma camera
(b) CAT scan
(c) Radiotracer technique
(d) Gamma ray spectroscopy

Concept Questions :-

Radioactivity
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: