The energy required to remove and electr...

The energy required to remove and electron from the surface of sodium metal is ` 2. 3 eV`. What is the longest wavelength of radiation with which it can shown photoelectric effect ?

`5.4 xx 10^(-17) m`

`5. 4 xx 10^(-8) m`

`5.4 xx 10^(-7) m`

`5.4 xx 10^(-9) m`

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