A laser produces 25.0 mW of light. In 4.00 hr , the laser emits 6.04×1020 photonsWhat...

A laser produces 25.0 mW of light. In 4.00 hr , the laser emits 6.04×1020 photonsWhat is the wavelength of the laser?

Solutions

Expert Solution

Power = 25.0 mW

= 0.025 W

time = 4.00 hr

= 4.00*3600 s

= 14400 s

use:

Energy = power * time

= 0.025 W * 14400 s

= 360 J

This is energy of 6.04*10^20 photons

so,

energy of 1 photon = Energy / number of photon

= 360 J / (6.04*10^20)

= 5.96*10^-19 J

use:

E = h*c/lambda

5.96*10^-19J =(6.626*10^-34 J.s)*(3.0*10^8 m/s)/lambda

lambda = 3.34*10^-7 m

Answer: 3.34*10^-7 m

queen_honey_blossom answered 1 year ago

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