posted by Jessica .
What is the energy in joules of an x-ray photon with wavelength 8.40*10e-10 m?
(b) Convert the energy to electron volts.
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