1 gm of radium emits 3.6x10^10 alpha particles per sec. the speed of alpha particles is 10^7 m/s and mass of alpha particle is 6.6x10^ -27 kg. What is the total kinetic energy of alpha particles emitted form 1 gm. of radium.

it is a pretty straightforward question

but is it the total kinetic energy in one second?

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