The beam of light has three wavelengths 4144 mathringA, 4972 mathringA and 6216 mathringA with a total intensity of 3.6 × 10-3 Wm 2 equally distributed amongst the three wavelengths. The beam falls normally on the area 1 cm 2 of a clean metallic surface of work function 2.3 eV. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in 2 s.

Question

The beam of light has three wavelengths 4144 mathringA, 4972 mathringA and 6216 mathringA with a total intensity of 3.6 × 10-3 Wm 2 equally distributed amongst the three wavelengths. The beam falls normally on the area 1 cm 2 of a clean metallic surface of work function 2.3 eV. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in 2 s. (A) 2 × 109 (B) 1.075 × 1012 (C) 9 × 108 (D) 3.75 × 106

Tardigrade Admin · Accepted Answer

Correct answer is (b) 1.075 × 1012

$2 \times 1 0^{9}$

$1.075 \times 1 0^{12}$

$9 \times 1 0^{8}$

$3.75 \times 1 0^{6}$

Correct answer is (b) $1.075 \times 1 0^{12}$

2×109

1.075×1012

9×108

3.75×106

Correct answer is (b) 1.075×1012

$2 \times 1 0^{9}$

$1.075 \times 1 0^{12}$

$9 \times 1 0^{8}$

$3.75 \times 1 0^{6}$

Correct answer is (b) $1.075 \times 1 0^{12}$