# physics

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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
?

• physics -

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

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