Light of frequency 7.21 × 1014 Hz is incident on a metal surface. The cut-off wavelength for photoelectric emission from the metal surface is 540 nm. Determine the maximum speed of the photoelectrons emitted from the surface. (Given: h = 6.63 × 10-34 Js, mass of an electron = 9.1 × 10-31 kg).
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Answer:
0.26
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