A beam of atoms moving in a certain direction can be slowed down if they absorb photons from a laser beam moving in the opposite direction and subsequently spontaneously emit photons isotropically. For a beam of Sodium atoms (mass number A = 23) with speed 600ms-1, if a laser beam of wavelength 589 nm is used, the number of such absorption and emission cycles needed to bring a Sodium atom to rest would be approximately (a) 1.3 x 105 (b) 1.3 x 104 (c) 2.1 x 103 (d) 2.1 x 104
A beam of atoms moving in a certain direction can be slowed down if they absorb photons from a laser beam moving in the opposite direction and subsequently spontaneously emit photons isotropically. For a beam of Sodium atoms (mass number A = 23) with speed 600ms-1, if a laser beam of wavelength 589 nm is used, the number of such absorption and emission cycles needed to bring a Sodium atom to rest would be approximately (a) 1.3 x 105 (b) 1.3 x 104 (c) 2.1 x 103 (d) 2.1 x 104
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Transcribed Image Text:A beam of atoms moving in a certain direction can be slowed down if they
absorb photons from a laser beam moving in the opposite direction and
subsequently spontaneously emit photons isotropically. For a beam of Sodium
atoms (mass number A = 23) with speed 600ms-1, if a laser beam of wavelength
589 nm is used, the number of such absorption and emission cycles needed to
bring a Sodium atom to rest would be approximately
(a) 1.3 x 105
(b) 1.3 x 104
(c) 2.1 x 103
(d) 2.1 x 104
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