A point source of light emits photons of energy 3.5 eV each. If the power of the source is 2.0 W, then the number of photons emitted per second is:
The energy of each photon is given as . We need to convert this to Joules to use the formula for the number of photons emitted per second.
Therefore, the energy of each photon in Joules is .
The power of the source is given as .
Using the formula for the number of photons emitted per second, we get:
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