One manifestation of particle-wave duality is that photons carry momentum, even

Question

One manifestation of particle-wave duality is that photons carry momentum, even though they have no mass. The same relationship between wavelength and momentum that applies to matter holds for radiation. c = 2.998 108 ms h = 6.626 10-34 Js

Calculate the momentum in SI units of one photon of wavelength 650 nm . Express your answer to three significant figures and include the appropriate units.

Find the total energy in a beam of 650 nm wavelength radiation if the beam has exactly enough momentum to accelerate a 2.0 g marble by 0.010 ms . Express your answer to two significant figures and include the appropriate units. E =

Explanation / Answer

P = h/lambda = 6.626*10^-34 / (650*10^-9) = 1.019*10^-27 kgm/s

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