In an experiment light of a particular wave-length is incident on a metal surfac

Question

In an experiment light of a particular wave-length is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the following? 1. None of these would produce the desired results 2. Increase the intensity and the wavelength 3. Decrease the intensity and increase the wavelength of the light 4. decrease the intensity and the wavelength of the light 5. increase the intensity and decrease the wavelength of the light

Explanation / Answer

Increasing intensity (quantity of photons) give more electrons. Increasing wavelength implies decreasing photon energy, which means that electrons coming off will have lower energy

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