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%
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A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is

(1) 120 min                   

(2) 80 min

(3) 30 min                     

(4) 20 min

Subtopic:  Radioactivity (OLD NCERT) |
 72%
From NCERT
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The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant 

(1) 40 year, 0.9173/year           

(2) 90 year, 9.017/year

(3) 80 year, 0.0173 year           

(4) None of these

Subtopic:  Radioactivity (OLD NCERT) |
 85%
From NCERT
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A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days

(1) 0.5               

(2) 0.25

(3) 0.125           

(4) 0.33

Subtopic:  Radioactivity (OLD NCERT) |
 85%
From NCERT
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Starting with a sample of pure Cu6678 of it decays into Zn in 15 min. The corresponding half-life is 

(1) 5 min               

(2) 712 min
(3) 10 min             

(4) 15 min

Subtopic:  Radioactivity (OLD NCERT) |
 81%
From NCERT
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A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in 

(1) 256 year           

(2) 128 year

(3) 64 year             

(4) 24 year

Subtopic:  Radioactivity (OLD NCERT) |
 84%
From NCERT
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A nucleus of mass 218 amu in free state decays to emit an α-particle. Kinetic energy of the α-particle emitted is 6.7 MeV. The recoil energy (in MeV) of the daughter nucleus is

(1) 1.0             

(2) 0.5

(3) 0.25           

(4) 0.125

Subtopic:  Types of Decay |
 64%
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C14 has half life 5700 years. At the end of 11400 years, the actual amount left is  

(1) 0.5 of original amount

(2) 0.25 of original amount

(3) 0.125 of original amount

(4) 0.0625 of original amount

Subtopic:  Radioactivity (OLD NCERT) |
 77%
From NCERT
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Mean life of a radioactive sample is 100 seconds. Then its half life (in minutes) is

(1) 0.693               

(2) 1

(3) 10-4                 

(4) 1.155

Subtopic:  Radioactivity (OLD NCERT) |
 68%
From NCERT
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A86222B84210. In this reaction how many α and β particles are emitted 
(a) 6α, 3β          (b) 3α, 4β 
(c) 4α, 3β          (d) 3α, 6β  

Subtopic:  Types of Decay |
 83%
From NCERT
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