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The threshold wavelength for a metal is 680 nanometers. Find the maximum kinetic energy of photoelectrons emitted, when a radiation of wavelength 560 nanometers is incident on the metal.

Provide the answer as: \(\text{answer}\times10^{20}\)

Detains and assumptions:

  • Threshold frequency: The minimum frequencyof radiation below which no photoelectric emission takes place is called threshold frequenc(\(\delta_0\)).

  • Take the Planck's constant \(=6.625\times10^{-34}m^2kg/s\) and velocity of light \(=3\times10^8m/s\).

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