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Question:
When we excite some atoms by heat collision or electrical discharge they will

1.radiate electromagnetic energy with a continuous distribution of wavelength

2.absorb particular wavelengths when white light is incident on them

3.radiate electromagnetic energy of discrete characteristic wavelength

4.emit either invisible or visible light

Posted Date:-2021-08-27 05:17:15

More MCQS Questions and answers

  1. A completely filled band is called
  2. A ferromagnet will become fully magnetized at
  3. A vacant or partially filled band is called
  4. A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is
  5. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is
  6. Any alteration produced in shapes length or volume when a body is subjected to some external force is called
  7. Bracket series is obtained when all transition of electron terminate on
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  9. Energy needed to magnetize and demagnetize is represented by
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  12. Ground state energy of the 4th orbit in a H-atom is
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  19. In obtaining an X-ray photograph of our hand we use the principle of
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  38. The penetrating power of X-rays depends on their
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