The energy required to remove an electron from metal X is E = 3.31 × 10-20 J . Calculate the maximum wavelength of light that can photo eject an electron from metal X

Question

The energy required to remove an electron from metal X is E = 3.31 × 10-20 J . Calculate the maximum wavelength of light that can photo eject an electron from metal X  (A)  6.01 × 10-6 m  (B)  3.10 × 10-3 m  (C)  5.01 × 10-6 m  (D) None of these

Tardigrade Admin · Accepted Answer

Energy, E=(hc/λ) or λ=(hc/E)=(6.626×10-34×3×108/3.31×10-20) =6.00×10-6 m

Q. The energy required to remove an electron from metal $X$ is $E = 3.31 \times 1 0^{- 20} J$ . Calculate the maximum wavelength of light that can photo eject an electron from metal $X$

$6.01 \times 1 0^{- 6} m$

$3.10 \times 1 0^{- 3} m$

$5.01 \times 1 0^{- 6} m$

None of these

Energy, $E = \frac{h c}{λ}$
or $λ = \frac{h c}{E} = \frac{6.626 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{3.31 \times 1 0 ^{- 20}}$
$= 6.00 \times 1 0^{- 6} m$

Q. The energy required to remove an electron from metal X is E=3.31×10−20J . Calculate the maximum wavelength of light that can photo eject an electron from metal X

6.01×10−6m

3.10×10−3m

5.01×10−6m