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An isolated hydrogen atom emits a photon of 10.2 eV . Determine the momentum of photon emitted

Which of the transitions in hydrogen atom emits a photon of lowest frequecny (n = quantum number)?

Which of the transitions in hydrogen atom emits a photon of lowest frequecny (n = quantum number)?

Whenever a hydrogen atom emits a photon in the Balmer series, it may emit another photon in the Balmer series it must emit another photon in the Lyman series the second photon, if emitted, will have a wavelength of about 122 nm it may emit a second photon, but the wavelength of this photon cannot be predicted

When a hydrogen atom emits a photon in going from n=5 to n=1, its recoil speed is almost

When a hydrogen atom emits a photon in going from n=5 to n=1, its recoil speed is almost