Question

Calculate the number of photons emitted in 10 hours by a 60 watt sodium lamp wavelength of photon = 5839 angstrom

Answer 1

Ur Ans should be appropriately = 0.33*10 ^20

Answer 2

Answer:

Watt = Energy/Time = Joule/sec

Total energy = 60×10×3600J

let the no. of photons be Z

then,

60×10×3600J = Z { 12420/5893 } × 1.6 × 10^(-9)

by solving,

Z = 6.4 × 10^(24) Answer!