The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 mathringA Its work function is

Question

The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 mathringA Its work function is (A) 4 × 10-19 J (B) 1 J (C) 2 × 10-19 J (D) 3 × 10-19 J

Tardigrade Admin · Accepted Answer

W0 = (hc/λ0)=(6.63 × 10 -34 × 3 × 108 /5000 ×10-10)=4 × 10-19 J

Q. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000 \overset{˚}{A}$ Its work function is

$4 \times 1 0^{- 19} J$

$1 J$

$2 \times 1 0^{- 19} J$

$3 \times 1 0^{- 19} J$

$W_{0} = \frac{h c}{λ _{0}} = \frac{6.63 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{5000 \times 1 0 ^{- 10}} = 4 \times 1 0^{- 19} J$

Q. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000A˚ Its work function is

4×10−19J

1J

2×10−19J

3×10−19J