How Do You Calculate Wavelength and Recoil Velocity in Nuclear Physics Problems?

[suspecteg]

Homework Statement

hey, 2 questions thanks:
1.A gamma ray is converted to an electron and a positron. If 50% of the gamma ray energy becomes kinetic energy, what is the wavelength of the gamma ray?

2.A nucleus of a radioactive element (mass 10^-25) loses 10^-26g during gamma decay. if the gamma ray has a wavelength of 10^-14m, what is the recoil velocity of the nucleus?

Homework Equations

no idea, we haven't learned about wavelength at all.. however these two questions were in a big revision booklet so id rather be safe than sorry.

The Attempt at a Solution

thanks.

 

[stanton]

You looks like you are just throwing question insincerely to board us to answer. Try to write more carful next time. If you show your attempt, I will tell you the answer. And If you haven't learn it, don't worry. You will be perfectly safe.