Question
Question: 16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that ...
16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is.
A
2 hour
B
1 hour
C
21hour
D
41hour
Answer
21hour
Explanation
Solution
N=N0(21)t/T1/2⇒ 1=16(21)T1/22 ⇒ T1/2=21hour