Question

how many photons of Light having wavelength 500 NM are necessary to provide 1 joule of energy​

Answer 1

Answer:

here we apply the same formula of speed wavelength relation first and then plncks quantum theory

Answer 2

$25\times 10^{17}$ photons of Light having wavelength 500 NM are necessary to provide 1 joule of energy​.

Explanation:

The relation between energy and wavelength of light is given by Planck's equation, which is:

$E=\frac{Nhc}{\lambda}$

where,

E = energy of the light

N = number of photons

h = Planck's constant

c = speed of light

$\lambda$ = wavelength of light =$500nm=500\times 10^{-9}m$

$1J=\frac{N\times 6.6\times 10^{-34}\times 3\times 10^8}{500\times 10^{-9}}$  

$N=25\times 10^{17}$

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