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# Tag Archives: nucleus

## Estimating the size of nucleus

Hi!

How do you figure out the size of a nucleus?  Especially, a Helium-4 nucleus.

Do you have any good charts online I could use?

I would appreciate it if you would write back.

Thanks

Michael

An estimate of the size of nucleus (nuclear radius) can be made from the empirical formula $R&space;=&space;R_{0}A^{1/3}$ where R0 is an empirical constant whose value is 1.25 x 10-15m, A is the mass number.

The following document may be helpful to you for further information

## expression for magnetic moment of the electron

An electron is moving with velocity v in an atom with orbital radius R.  Derive the expression for magnetic moment of the electron.

## A question from Atoms & Nucleus Decay

Plutonium decays with a half-life of 24000 years.If plutonium is stored for 72000 years.What fraction of it remains?