# Sodium atoms travel at a velocity of 500m/s upstreams a laserbeam with wavelength 588.995 nm?

a) Calculate the wavelength for the photons that hit the atoms (from the atoms perspecitve)

b) Calculate the change in velocity ∆v for the atom for each photon it absorbs.

c) Determine how many times an atom would need to absorb a photon to brake down to a speed v ≈ 0.

Thank you!

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