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

How many photons are there in each cubic meter near the earth's surface at any instant?

Open in App
Solution

Total number of photons emitted in time dt=ndt where dt=drc where dr and c are the displacement and
speed of light.
Now number of photons per unit volume =PπdrhC2
Pλ4πr2Chwhere P4πr2=1.4×103 and λ=5000˚A
=1.4×103(5×1076.63×1034×3×108)=3.51×1021

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Quantum Numbers
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon