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The maximum kinetic energy of photoelectrons is 3.10 eVeV . When the wavelength of the light...

The maximum kinetic energy of photoelectrons is 3.10 eVeV . When the wavelength of the light is increased by 50%, the maximum energy decreases to 1.10 eVeV .

Part A

What is the work function of the cathode?

Part B

What is the initial wavelength ?
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