In photoelectric effect, the threshold wavelength of sodium is 5000 . Find its work function (.h=6.6× (10)- 34 J s, c=3× (10)8 (m s)- 1, 1 eV=1.6× (10)- 19 J.)

Question

In photoelectric effect, the threshold wavelength of sodium is 5000 . Find its work function (.h=6.6× (10)- 34 J s, c=3× (10)8 (m s)- 1, 1 eV=1.6× (10)- 19 J.) (A) 7.5 texteV (B) 2.5 texteV (C) 10 texteV (D) 5.0 texteV

Tardigrade Admin · Accepted Answer

The work function of sodium W = (h c/λ 0) W=(6.6 × 10- 34 × 3 × 108/5 × 10- 7) or W=3.96× 10- 19 J or W=2.5 eV

Q. In photoelectric effect, the threshold wavelength of sodium is $5000$ . Find its work function $(h = 6.6 \times (10)^{- 34} J s, c = 3 \times (10)^{8} (m s)^{- 1}, 1 e V = 1.6 \times (10)^{- 19} J)$

$7.5 eV$

$2.5 eV$

$10 eV$

$5.0 eV$

The work function of sodium
$W = \frac{h c}{λ _{0}}$
$W = \frac{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{5 \times 1 0 ^{- 7}}$
or $W = 3.96 \times 1 0^{- 19} J$
or $W = 2.5 e V$

Q. In photoelectric effect, the threshold wavelength of sodium is 5000 . Find its work function (h=6.6×(10)−34Js,c=3×(10)8(ms)−1,1eV=1.6×(10)−19J)

7.5eV

2.5eV

10eV

5.0eV