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(C) The photoelectric effect occurs when the frequency of incident light is greater than the threshold frequency, or equivalently, when the wavelength

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Indigo

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(C) The photoelectric effect occurs when the frequency of incident light is greater than the threshold frequency, or equivalently, when the wavelength is less than the threshold wavelength $ (\lambda Given that green light causes emission but yellow light does not, the threshold wavelength $ (\lambda_{th}) $ lies between the wavelengths of green and yellow light.In the visible spectrum, the order of wavelengths is: $ \lambda_{Red} > \lambda_{Orange} > \lambda_{Yellow} > \lambda_{Green} > \lambda_{Blue} > \lambda_{Indigo} > \lambda_{Violet} $.Since the wavelength of indigo light is smaller than that of green light, it has a higher frequency and energy, thus it will cause the emission of photo-electrons.

When green light is incident on the surface of a metal, it emits photo-electrons, but there is no such emission with yellow light. Which one of the following colours can produce emission of photo-electrons?

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