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Classical Mechanics Level pending

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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