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When a metal surface is illuminated by m...

When a metal surface is illuminated by monochromatic radiation of `lambda = 3000 A^@` electrons are emitted. Emission of electrons stop when the surface is illuminated of `lambda = 3500 A^@`. Then the threshold wavelength for the metal is

A

`3000 A^@`

B

`3500 A^@`

C

`gt 3500 A^@`

D

less than `3500A^@` but more than `3000 A^@`

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