Atoms and NucleiHalf Life and Mean Life (AIIMS (All India Institute of Medical Sciences) Physics): Questions 1  6 of 8
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Question number: 1
» Atoms and Nuclei » Half Life and Mean Life
Appeared in Year: 2006
Question
The fossil bone has a ratio, which is of that in a living animal bone. If the halflife of ^{14}C is 5730 years, then the age of the fossil bone is –
Choices
Choice (4)  Response  

a.  22920 years 

b.  11460 years 

c.  45840 years 

d.  17190 years 

Question number: 2
» Atoms and Nuclei » Half Life and Mean Life
Appeared in Year: 2004
Question
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of –
Choices
Choice (4)  Response  

a.  10^{4} 

b.  10^{5} 

c.  10^{6} 

d.  10^{3} 

Question number: 3
» Atoms and Nuclei » Half Life and Mean Life
Appeared in Year: 2003
Question
A radioactive substance decays to of its initial activity in 40 days. The halflife of the radioactive substance expressed in days is –
Choices
Choice (4)  Response  

a.  5 

b.  10 

c.  20 

d.  2.5 

Question number: 4
» Atoms and Nuclei » Half Life and Mean Life
Question
A radioactive substance decays to of its initial activity in 20 days. The halflife of the radioactive substance expressed in days is –
Choices
Choice (4)  Response  

a.  2 

b.  6 

c.  8 

d.  12 

Question number: 5
» Atoms and Nuclei » Half Life and Mean Life
Question
A radioactive substance decays to of its initial activity in 48 days. The halflife of the radioactive substance expressed in days is –
Choices
Choice (4)  Response  

a.  32 

b.  8 

c.  30 

d.  16 

Question number: 6
» Atoms and Nuclei » Half Life and Mean Life
Appeared in Year: 1998
Question
Half – life period of two radioactive substance are are 40 minute and 20 minute respectively, then after 80 minute ratio of the remaining nuclei will be – (Initially both have equal active nuclei) [AIPMT]
Choices
Choice (4)  Response  

a.  16: 1 

b.  4: 1 

c.  1: 2 

d.  8: 1 
