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A heat lamp produces 41.0 watts of power at a wavelength of 6.2 μm . How...

A heat lamp produces 41.0 watts of power at a wavelength of 6.2 μm . How many photons are emitted per second? (1 watt = 1 J/s)

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Answer #1

we have:

wavelength = 6.2*10^-6 m

1st calculate energy of 1 photon

we have:

wavelength = 6.2*10^-6 m

we have below equation to be used:

Energy = Planck constant*speed of light/wavelength

=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(6.2*10^-6 m)

= 3.206*10^-20 J

number of photon = total energy/energy of 1 photon

n = 41.0/3.206*10^-20

= 1.28*10^21

Answer: 1.28*10^21

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