Which of the following processes represents a gamma-decay

(1) XZA+γXZ-1A+a+b 

(2) XZA+n01XZ-2A-3+c

(3) XZAXZA+f

(4) XZA+e-1  XZ-1A+g

Subtopic:  Types of Decay |
 85%
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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 

(1) 400 μs               

(2) 6.3 μs 

(3) 40 μs                 

(4) 300 μs

Subtopic:  Radioactivity (OLD NCERT) |
 84%
From NCERT
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The half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 116th part

(1) 12 h             

(2) 16 h

(3) 48 h             

(4) 192 h

Subtopic:  Radioactivity (OLD NCERT) |
 81%
From NCERT
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A radioactive substance has an average life of 5 hours. In a time of 5 hours 

(1) Half of the active nuclei decay

(2) Less than half of the active nuclei decay

(3) More than half of the active nuclei decay

(4) All active nuclei decay

Subtopic:  Radioactivity (OLD NCERT) |
 67%
From NCERT
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Which of the following radiations has the least wavelength

(1) X-rays             

(2) γ-rays

(3) β-rays             

(4) α-rays

Subtopic:  Types of Decay |
 75%
From NCERT
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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 

(1) 0.8 In 2               

(2) 0.4 In 2

(3) 0.2 In 2               

(4) 0.1 In 2

Subtopic:  Radioactivity (OLD NCERT) |
 74%
From NCERT
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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 

(1) Gamma camera

(2) CAT scan

(3) Radiotracer technique

(4) Gamma ray spectroscopy

Subtopic:  Radioactivity (OLD NCERT) |
 57%
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A radioactive decay chain starts from Np93237 and produces Th90229 by successive emissions. The emitted particles can be 

(1) Two α-particles and one β-particle

(2) Three β+ particles

(3) One α particle and two β+ particles

(4) One α particle and two β- particles

Subtopic:  Radioactivity (OLD NCERT) |
 82%
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The half-life of a sample of a radioactive substance is 1 hour. If 8×1010 atoms are present at t = 0, then the number of atoms decayed in the duration t = 2 hour to t = 4 hour will be

(1) 2×1010         

(2) 1.5×1010

(3) Zero               

(4) Infinity

Subtopic:  Radioactivity (OLD NCERT) |
 72%
From NCERT
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Carbon dating is best suited for determining the age of fossils if their age in years is of the order of 
(1) 103            

(2) 104

(3) 105             

(4) 106

Subtopic:  Radioactivity (OLD NCERT) |
 57%
From NCERT
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