When light with a wavelength of 400 nm falls on the surface of sodium , electrons with a kinetic energy of1.05 xx 10^(5) " J mol"^(-1) are emitted . What is the minimum energy needed to remove an electron from sodium ?

When light with a wavelength of 400 nm falls on the surface of sodium

1.	When light with a wavelength of 400 nm falls on the surface of sodium , electrons with a kinetic energy of1.05 xx 10^(5) " J mol"^(-1) are emitted . What is the minimum energy needed to remove an electron from sodium ?
Answer» ANSWER :`a=3.2255 XX 10^(19) J `,