Resource Problems

Question 1

A gamma-ray photon energy is often expressed in electronvolts (eV).
What is the wavelength of a gamma-ray of keV energy?

Answer 1

1. Use the formula wavelength(nm) = 119,626.6/deltaE(kj/mol) after converting eV to kJ/mol.

Question 2

Unit of the Activity <-> 1/2 life calculation

Answer 2

Activity = k * N

1) You want to calculate the amount of the substance in ATOMS. So you get moles, then avagadro.
2) You want the k in SECONDS. So, you convert the half-life to seconds, THEN use that value to get K.