When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $\times$ 105 J mol$-$1. What is the minimum energy needed to remove an electron from the metal? (h = 6.626 $\times$ 10$-$34 Js, c = 3 $\times$ 108 ms$-$1, NA = 6.022 $\times$ 1023 mol$-$1)

Question

When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $\times$ 10⁵ J mol^$-$1. What is the minimum energy needed to remove an electron from the metal?

(h = 6.626 $\times$ 10^$-$34 Js, c = 3 $\times$ 10⁸ ms^$-$1, N_A = 6.022 $\times$ 10²³ mol^$-$1)

2.31 $\times$ 10⁵ J mol^$-$1

2.31 $\times$ 10⁶ J mol^$-$1

3.84 $\times$ 10⁴ J mol^$-$1

3.84 $\times$ 10^$-$19 J mol^$-$1

Solution

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