# Nuclear Physics homework

1. Apr 4, 2005

### whitetigerboy56

OK ... i figured out the momentum, however i need help with find the mass. anyone know how?

What is the momentum of a 0.33 nm X-ray photon?
2.009E-24 kg · m/s
What is its effective mass?
_________ kg

thanks

2. Apr 4, 2005

### dextercioby

$h\frac{c}{\lambda}=mc^{2}$ is all u need to know...

Daniel.

3. Apr 5, 2005

### whitetigerboy56

Dude... Thanks