The kinetic energy of an electron is E w...

The kinetic energy of an electron is E when the incident wavelength is `lamda` To increase ti KE of the electron to 2E, the incident wavelength must be

`2lambda`

`lambda//2`

`((hclambda))/((Elambda+hc))`

`((hclambda))/((Elambda-hc))`

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