Question

Calculate no. of photons of light with a wavelength of 4000 pm that provides 1 J of energy.

Answer 1

Answer:

0.2 x $10^{17}$

Explanation:

E = h c n/ λ (n is number of photons)

n = E λ/ h c

  = 1 x 4000 x $10^{-12}$ / 6.68 x $10^{-34}$ x 3 x $10^{8}$

  =  0.2 x $10^{17}$ photons