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In a photo-emissive cell, with exciting ...

In a photo-emissive cell, with exciting wavelength `lambda_1`, the maximum kinetic energy of electron is K. If the exciting wavelength is changed to `lambda_2`, the maximum kinetic energy of electron is 2K then

A

`lambda_1=2lambda_2`

B

`lambda_1 gt 2lambda_2`

C

`lambda_1 lt 2lambda_2`

D

`lambda_1=lambda_2/2`

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