Practice portal › Dual Nature of Matter and Radiation › Stopping Potential and Threshold Frequency
Asked in GSEB Board July 2015 · Threshold frequency
Given: ultraviolet light does not eject electrons from this metal.
Idea: an electron is emitted only if one photon's energy h u is at least the work function φ₀, that is, only if u ≥ u₀.
So the threshold frequency u₀ of this metal lies above the ultraviolet frequencies used.
Of the options, only X-rays have a higher frequency than ultraviolet; infrared, radio waves and visible light are all lower.
So photoelectrons may be emitted with X-rays.
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