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)

In a hypothetical radioactive material, the total number of active pho

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