Question

1gm of  94Pu-239 is an α-emitter with a half life of 24400 yrs. given 1g sample of this plutonium how many α-particles will it emit per second?

(a) 2.27*10^9

(b) 2.27*10^10

(c) 2.27*10^11

(d) 2.27*10^12

Joshi sir comment

dn/dt = kn

so dn = (0.6932/24400*3.1*107)*(1/239)*6.023*1023*1

solve 

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