Suppose that all the energy from a 75-watt light bulb came in the form of photons with wavelength 600?
a) Calculate the energy of a single photon with wavelength 600 .
b)How many 600- photons must be emitted each second to account for all the light from this 75-watt light bulb?
I’m presuming you mean 600nm.
e = h f
f = c/lambda
f = 3e8 / 600e-9 = 5e14
e = 6.626e-34 * 5e14 = 3.313e-19 joules per photon
so 1/3.313e-19 = 3.018e18 photons per joule
p = e/t
so 75 watts would need 3.018e18 * 75 photons per second
= 2.264e20 photons per second.
Cheers.
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