Light of wavelength lambda(A) and lambda...

Light of wavelength `lambda_(A)` and `lambda_(B)` falls on two identical metal plates A and B respectively . The maximum kinetic energy of photoelectrons in `K_(A)` and `K_(B)` respectively , then which one of the following relations is true ? `(lambda_(A) = 2lambda_(B))`

`K_Alt(K_B)/(2)`

`2K_A=K_B`

`K_A=2K_B`

`K_Agt2K_B`

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