SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A sample of radioactive material A, that has an activity of 10m Ci(l Ci=3.7  1010decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20mCi.  The correct choice for hall-lives of A and B an would then be respectively:

a.

20 days and 5 days

b.

20 days and 10 days

c.

5 days and 10 days

d.

10days and 40days


Question ID - 50055 :-

A sample of radioactive material A, that has an activity of 10m Ci(l Ci=3.7  1010decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20mCi.  The correct choice for hall-lives of A and B an would then be respectively:

a.

20 days and 5 days

b.

20 days and 10 days

c.

5 days and 10 days

d.

10days and 40days

1 Answer
5876 Votes
3537

Answer Key : (a) -

Activity A= N

For A    10=(2N0) A

For B     20=N0 B

  B=4 A (T1/2)A=4(T1/2)B



Next Question :

Consider a tank made of glass (reiractive index 1.5) with a thick bottom.  It is filled with a liquid of refractive index ., A student finds that, irrespective of what the incident angle i(see figure0 is for a beam of light entering the liquid, is never reflected from the liquid glass interface happen, the minimum value of  is:

a.

 

b.

 

c.

 

d.

 


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