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 Incoming links: Photon emission rate from monochromatic power

Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2014 / Paper 1 / A1 / Solution 2026-10-20

Each photon has energy

h f

, giving the photon emission rate from monochromatic power and wavelength

\dot{N} = \frac{P}{h f} = 8.38 \times 1 0^{22} s^{- 1}, λ = \frac{c}{f} = 0.167 m .

Here

P

is radiated signal power, not the phone's total electrical consumption.

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