Answer:
[tex] N=2.18\cdot 10^{20}photons/s[/tex]
Explanation:
The energy of a photon is: [tex] E=h\nu=h\frac{c}{\lambda}[/tex] when h is the Planck constant.
[tex] h=6.63\cdot 10^{-34}Js[/tex]
[tex] c=3.8\cdot 10^{8}m/s[/tex]
Then, we calculate the energy of a photon with a wavelength equal to 550 nm.
[tex]E= 4.58\cdot 10^{-19}J[/tex]
To find the number of photons we can use this equation:
[tex]N=\frac{P}{E}=\frac{100}{4.58\cdot 10^{-19}}=2.18\cdot 10^{20} photons/s[/tex]
Have a nice day!
