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I'm actually working on an assignment in my natural science course and I'm stuck on this question cause i'm not sure how to use the variables in the equation.

The californium-242 nucleus 242/98 Cf decays via alpha decay with half life of 210s

A)what is its daughter nucleus?

B) if we originally have 10 000 californium-242 nuclei, how many will remain as californium after one half-life? Explain

C)if we originally have 10 000 californium-242 nuclei, how many will remain as californium after five half-life? Explain

Ok so how I view this... I need to use the Decay Law equation to find the daughter nucleus rite? since its going through alpha decay.

So equation would be N(t) = N e^(-λt)

N(210) = N e^(-λ210)

is N = 242?

So... wuts e? and λ?