A metallic surface has a threshold wavelength
5200 Å. This surface is irradiated by
monochromatic light of wavelength 4500 A.
Which of the following statements is true?
(a) the electrons are emitted from the surface
having energy between 0 and infinity
(b) the electrons are emitted from the surface
having energy between 0 and certain finite
maximum value
(c) the electrons are emitted from the surface,
all having certain finite energy
(d) no electron is emitted from the surface
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