Physics, 16.09.2019 23:30 Lydiaxqueen
A100 w incandescent light bulb converts approximately 2.5% of the electrical energy supplied to it into visible light. assume that the average wavelength of the emitted light is λ = 540 nm, and that the light is radiated uniformily in all directions.
a) what is the energy of each photon in ev?
b)how many photons per second, n, would enter an aperture of area a = 2cm2 located a distance d = 5 m from the light bulb?
c)suppose, instead, that the average photon wavelength is 810 nm. how many photons per second, n', would enter the aperture?
Answers: 2
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