Q.

The kinetic energy of electron is E when incident light has wavelength λ.  To increase the kinetic energy to 2E, the incident light must have wave length

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answer is 2.

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Detailed Solution

hcλ=hvo+E    and    hcx=hvo+2E    solving,   x =hcλEλ+hc
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The kinetic energy of electron is E when incident light has wavelength λ.  To increase the kinetic energy to 2E, the incident light must have wave length