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.
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