When ultraviolet light does not produce the photoelectric effect from a metal, which incident radiation may produce it?
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Question

When ultraviolet light does not produce the photoelectric effect from a metal, which incident radiation may produce it?

G1 Physics · Accepted Answer

No photoemission means ultraviolet photon energy is below the threshold W. A shorter wavelength and higher-frequency photon is required; X-rays have higher photon energy than ultraviolet. Answer: B.