CBSE  /  Class 12  /  Physics  /  Dual Nature of Radiation and Matter

  • 1. 
    Which Characteristic of a target does the Mosley's law relate the frequency of X-rays?

  • density
  • atomic number
  • atomic weight
  • interatomic space

  • 2. 
    The charge of a photo electron is :

  • 9.1 × 10-31 C
  • 9.1 × 10-27 C
  • 9.1 × 10-24 C
  • none of these

  • 3. 
    The number of photons of frequency n present in energy E, in terms of Planck's constant h:

  • \(\frac{E}{nh}\)
  • nhE
  • \(\frac{nh}{E}\)
  • \(\frac{nE}{h}\)

  • 4. 
    Compared to liquids and solids, gases are:

  • good conductors of electricity
  • best conductors of electricity
  • very poor conductors of electricity
  • good or bad conductors of electricity depending upon the nature of the gas

  • 5. 
    The different stages of discharge in a discharge tube can be explained on the basis of:

  • the wave nature of light
  • the dual nature of light
  • wave nature of electrons
  • the collision between the charged particles emitted from the cathode the atoms of the gas in the tube

  • 6. 
    When an electron jumps across a potential difference of 1 V, it gains energy equal to :

  • 1.602 × 10-19 J
  • 1.602 × 1019 J
  • 1.602 × 1024 J
  • 1 J
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