Question: The photoelectric effect threshold wavelength for a certain metal is 400 nm. Calculate the maximum speed of photoelectrons if we use light having a wavelength

The photoelectric effect threshold wavelength for a certain metal is 400 nm. Calculate the maximum speed of photoelectrons if we use light having a wavelength of
(a) 300 nm,
(b) 400 nm, and
(c) 500 nm.

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