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Question: Two radioactive substances X and Y initially contain equal number of nuclei. X has a half-life of 1 ...

Two radioactive substances X and Y initially contain equal number of nuclei. X has a half-life of 1 hour and Y has a half-life of 2 hours. After two hours, the ratio of the activity of X to the activity of Y is –

A

1 : 4

B

1 : 2

C

1 : 1

D

2 : 1

Answer

1 : 1

Explanation

Solution

Use A = λN02t/T\frac { \lambda \mathrm { N } _ { 0 } } { 2 ^ { \mathrm { t } / \mathrm { T } } }