how long would a laser have to be on to emit only one photon? Say the power of the laser is 1 W at 500 nm.
Given , the power of laser is 1 W or J/s.
i.e. in 1 second laser is emitting photons of energy 1 Joule.
The wavelength () of laser = 500 nm = 500 x 10-9 m
We know that
Where, h = 6.63 x 10-34 J-s is Planck's constant
E is energy of the photon
C = 3 x 108 m/s is speed of the light
So, energy of a single photon emitting from the laser is
According to the question, the laser is emitting 1 Joule of energy per second.
So, total number of photons (N) emitting from the laser in 1 second is :
I.e. time taken by laser to emit 2.5 x 1018 photons = 1 second
So, time taken by laser to emit one photon = 1 / (2.5 x 1018) = 3.978 x 10-19 second
Hence, the laser have to be on for 3.978 x 10-19 second to emit only one photon.
For any doubt please comment and please give an up vote. Thank you.
how long would a laser have to be on to emit only one photon? Say the...
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