A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82 $\times$ 10¹⁷ photons/second,what is its power output in mW?

Question

Quizplus · Accepted Answer

We can use the formula to find power output:
Power = (Number of photons emitted per second) x (Energy per photon)
To find energy per photon, we can use the equation:
E = hc/λ
where h is Planck's constant, c is the speed of light, and λ is the wavelength of the light.

Plugging in the values given:
E = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (632.8 x 10^-9 m)
E = 3.135 x 10^-19 J

Power = (1.82 x 10^10 photons/s) x (3.135 x 10^-19 J/photon)
Power = 5.712 mW
Therefore, the answer is A) 57.2 mW.

A Helium-Neon Laser Emits Light at 632 ×\times× 1017 Photons/second,what Is Its Power Output in MW? A)57

A Helium-Neon Laser Emits Light at 632 $\times$ 10¹⁷ Photons/second,what Is Its Power Output in MW?
A)57