Answered: A rubidium atom (atomic mass 85) is… | bartleby

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3. A rubidium atom (atomic mass 85) is initially at room temperature and has a velocity of
v = 290 m/s due to its thermal motion. Consider the absorption of photons by this atom
from a laser beam of wavelength 2 = 780 nm. Assume the rubidium atom's initial
velocity v is directed into the laser beam and that the atom absorbs a new photon every
25 ns. How long will it take to slow the rubidium atom to 10 m/s? ( Hint use the
conservation laws, to calculate the change in momentum per photon)

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