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The work function of metal-I and mtal-II...

The work function of metal-I and mtal-II are 5 eV and 2.5 eV respectively. If the threshold wavelength of metal-I be `6000overset@A` then that for metal-II will be :

A

`3000overset@A`

B

`9000overset@A`

C

`12000overset@A`

D

`15000overset@A`.

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