wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?

Open in App
Solution

Wavelength =632.8 nm
=6328 Ao

Power =5 mW

E=hcλ

=12375λ(Ao)

Energy =123756328

=1.955 eV

Energy of photon in eV =1.955×1.6×1019
=3.12895×1019eV

Let no. of photons emitted in one second =n

No. of photons emitted per second

n=PowerEnergy of photon

=5×1033.1289×1019

=1.597×1016

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Hydrogen Spectrum
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon