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If amplitude is the intensity of the light, will increasing the amplitude just increase the number of photons? So increasing amplitude would not have an effect on the energy of the light overall?
Yep you got it! Like professor was talking about, if you increase the number of runners but no one has enough energy to get over the hurdles you will not get anywhere. If you want a photon/runner to get over the hurdle/release an electron you must increase the frequency not the wavelength:)
Yes! The number of photons increases with higher amplitude, but the energy per photon remains the same. Therefore, if a light at a certain frequency is unable to reach the threshold energy of a certain metal, a lower frequency light would be required.
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