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When light with a wavelength of 400 nm f...

When light with a wavelength of 400 nm falls on the surface of sodium , electrons with a kinetic energy of ` 1.05 xx 10^(5) " J mol"^(-1)` are emitted .
What is the minimum energy needed to remove an electron from sodium ?

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The correct Answer is:
`a=3.2255 xx 10^(19) J `,
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