1.

In a hypothetical radioactive material, the total number of active photons are 20000 and the decay constant is found out to be 4.916 X 10-17 per second. How much of the material will be left in a 100 years? (1 year = 365 days. Leap year is not assumed in the calculations)

A. 1589.99999
B. 19,999.9999
C. 19.999999
D. 123.99999
Answer» C. 19.999999


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