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The threshold frequency of potassium is ...

The threshold frequency of potassium is `3 xx 10^14 Hz`. The work function is

A

`1.0 xx 10^-19 J`

B

`2.0 xx 10^-19 J`

C

`4.0 xx 10^-19 J`

D

`0.5 xx 10^-19 J`.

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