The maximum kinetic energy of an electro...

The maximum kinetic energy of an electron is E when the incident wavelength is `lambda` To increase the maximum kinetic energy of the electron to 2E the incident wavelength must be :

`2lamda`

`(lamda)/(2)`

`(hclamda)/(Elamda+hc)`

`(2hclamda)/(Elamda+hc)`

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