8. Find the momentum of a photon in eV/c and in Kg. m/s if the wavelength is (a) 400nm; (b) 1 Å = 0.1 nm, (c) 3 cm; and (d) 2 nm.

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Physics

Ryan Levy

2 September, 11:29

8. Find the momentum of a photon in eV/c and in Kg. m/s if the wavelength is (a) 400nm; (b) 1 Å = 0.1 nm, (c) 3 cm; and (d) 2 nm.

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Caroline Booker · Answer 1

We use the formula: p = E/c where E = hc / λ. hence, p = h / λ. where h is the Planck's constant: 6.62607004 * 10-34 m2 kg / s and λ is the wavelenght.

a) p = 6.62607004 * 10-34 m2 kg / s / 0.1 x10^-9 m = 6.62607 x 10-24 m kg/s

b) p = 6.62607004 * 10-34 m2 kg / s / 3 x10^-2 m = 2.20869 x 10-32 m kg/s

b) p = 6.62607004 * 10-34 m2 kg / s / 2 x10^-9 m = 3.3130 x 10-25 m kg/s