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Home Q & A Board Science-Related Homework Help Physics
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Tito05 Tito05
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11 years ago
An atom emits a photon of light with a wavelength of 355 nanometers. How much energy
has the atom lost?
Answer in units of Joules

How do I do this?! I need help please. ASAP.
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wrote...
#1
11 years ago
E = hv = hc/?

where h = 6.626 X 10^-34 J-s
v = frequency
c = velocity of light = 3 X 10^8 m/s
? = 355 nm = 355 X 10^-9 m

putting the values...

E = 6.626 X 10^-34 X 3 X 10^8 / (355 X 10^-9) = 1.988 X 10^-25 / (355 X 10^-9) = 5.6 X 10^-19 j
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