Suppose the frequency of the emitted photon is f 0 when the electron of a stationary hydrogen atom jumps from a higher state m to a lower state n. If the atom is moving with a velocity v ( ≪ c ) and

Question

Suppose the frequency of the emitted photon is f 0 ​ when the electron of a stationary hydrogen atom jumps from a higher state m to a lower state n. If the atom is moving with a velocity v ( ≪ c ) and emits a photon of frequency f during the same transition, then which of the following statements are possible?

TestHub · Accepted Answer

Photon emitted perpendicular to v: f = f 0 ​ , since the same share of the transition energy goes to recoil KE as in the stationary atom. Emitted along v: the atom's KE decreases on recoil, so the photon takes more energy, f > f 0 ​ . Emitted opposite to v: the atom's KE increases, so f < f 0 ​ .

Physics - Modern Physics Question with Solution | TestHub

Options:(select one or more)

Doubts & Discussion