CBSE Class 12 Physics Dual Nature of Radiation and Matter Quiz 3

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

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

A density B atomic number C atomic weight D interatomic space

2. The charge of a photo electron is :

A 9.1 × 10^-31 C B 9.1 × 10^-27 C C 9.1 × 10^-24 C D none of these

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

A \(\frac{E}{nh}\) B nhE C \(\frac{nh}{E}\) D \(\frac{nE}{h}\)

4. Compared to liquids and solids, gases are:

A good conductors of electricity B best conductors of electricity C very poor conductors of electricity D 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:

A the wave nature of light B the dual nature of light C wave nature of electrons D 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 :

A 1.602 × 10^-19 J B 1.602 × 10¹⁹ J C 1.602 × 10²⁴ J D 1 J

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