How many photons are emitted per second? (1 watt = 1J/s )?

A heat lamp produces 24.0 watts of power at a wavelength of 6.8 micrometers.

3 Answers

Feb 20, 2025

Energy per photon at 6.8 microns is:E = hc/λ = (6.63x10^-34 J-s) (3.0x10^8 m/s) / (6.8 μm) (10^-6 m/μm) = 2.92x10^-20 J. Energy of 24 watts in 1 second:(24 J/s) (1 s) = 24.0 JThe number of photons is then:(24.0 J) / (2.92x10^-20 J/photon) = 8.21x10^20 photons, or 0.00136 moles of photons.... Show More

Prof. Carmelo Hilpert

Feb 20, 2025

10 to the power 24... Show More

Prof. Carmelo Hilpert

Feb 20, 2025

For the best answers, search on this site shorturl.im/avFO1the energy of a single photon is E = h c/L h=Planck's constant = 6.62x10^-34Js c=speed of light = 3x10^8m/s L=wavelength = 6.3x10^-7 m then the energy of one photon = 6.62x10^-34Js*3x10^8m/s / 6.3x10^-7m = 3.15x10^-19J if the laser outputs 1J/s, it requires a number of photons = 1J/s / 3.15x10^-19J/photon = 3.17x10^18photon/sec... Show More

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Dr. Reggie Bosco DVM

How many photons are emitted per second? (1 watt = 1J/s )?

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