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All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 

All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms  Correct Answer only i, iii & iv only

CONCEPT: 

  • The difference in energy between the energy levels of an atom is emitted in the form of radiation and the wavelength of emitted radiation is equal to the difference in energy levels.
  • The atom which emits continuous electromagnetic radiation has less energy difference between the levels 

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EXPLANATION:

  • The atom which emits continuous electromagnetic radiation has less energy difference between the levels 
  • From the given statement the other forms of matter emit a continuous form of electromagnetic radiations
  • Hence, the spacing between the energy levels of the atom will be less for solids and liquids compared to gases. Hence, statement ii is correct
  • Option 1 is contrary to option 2. Hence option 1 is incorrect
  • The wavelength and energy of the emitted radiation depend on the spacing between the atoms and energy levels. Hence statement (III) and (IV) are correct
  • The option containing the three statements I, iii, iv is the answer. Hence, option 2 is the answer

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