The photoelectric threshold frequency fo...

The photoelectric threshold frequency for potassium is `3 xx 10^(14)` Hz. The work function for potassium is `(h=6.625 xx 10^(-34)Js)`

`1.987 xx 10^(-19)J`

`1.987 xx 10^(+19)J`

`1.987 xx 10^(-13)J`

`1.987 xx 10^(+13)J`

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