From which source are a continuous emission spectrum and a line absorption spectrum simultaneously obtained?

  • A
    Bunsen burner flame
  • B
    The sun
  • C
    Tube light
  • D
    Hot filament of an electric bulb

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Which of the following spectra contains all frequencies from the high to the low frequency range?

An electron of a stationary hydrogen atom transitions from the fifth energy level to the ground level. The velocity that the atom acquires as a result of photon emission will be:

$A$ neutron moving with a speed $v$ makes a head-on collision with a stationary hydrogen atom in its ground state. The minimum kinetic energy of the neutron for which an inelastic collision will take place is....$eV$

In a $He-Ne$ laser,the metastable state exists in:

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