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The work function of a substance is 1.6 ...

The work function of a substance is 1.6 eV . The longest wavelength of light that can produce photoemission from the substance is

A

`2900 overset (@)(A)`

B

`3867 overset (@)(A)`

C

`5800 overset (@)(A)`

D

`7734 overset (@)(A)`

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