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Old Jul 27th 2010, 12:29 AM   #1
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Energy and momentum related to photon wavelength

An X-ray photon has a wavelength of 3.3*10^-10m. Calculate the momentum mass and energy of the particle associated with the photon, which moves with a velocity c.

I used p=h/(lambda) to find the momentum.
p=6.6*10^-34/3.3*10^-10=2.0*10^-24 Ns answer is supposed to be 2.2*10^-24Ns

Mass=p/c=2.0*10^-24 Ns/3.0*10^8=6.7*10^-33kg answer is supposed to be 6.2*10^-33kg

E=mc^2=6.7*10^-33*(3.9*10^8)^2=6*10^-16J which is correct.
Can anyone tell me why the first two answers are wrong?
Thanks!
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