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"A lamp rated at 32 W (1 W 5 1 J?s21) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?" Can someone explain the initial step to figure this question out?
By using the given wavelength, you can calculate the energy per photon (E=hv and c=vλ). Since the lamp is 32W which means 32 J/s, you know that in 2 seconds the lamp will generate 64 J. Divide 64J by the calculated energy per photon in order to find how many photons are emitted.
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