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If the threshold frequency be 2 xx 10^14...

If the threshold frequency be `2 xx 10^14 Hz`, the work function is

A

`1.6 xx 10^-19 J`

B

`3.2 xx 10^-19 J`

C

`6.6 xx 10^-20 J`

D

`13.2 xx 10^-20 J`.

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