What is the energy in joules of an x-ray photon with wavelength 8.40*10e-10 m?

____J?

(b) Convert the energy to electron volts.
___eV
?

1 answer

b. An electron volt? That is the charge on one electron (in C)times one volt..

a Volt-Coulomb is a Joule

a) energy= planck's constant*freq
where freq= speedlight/wavelength