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 Multiple Choice QuestionsMultiple Choice Questions

1.

During the propagation of electromagnetic waves in a medium:

  • Electric energy density is equal to the magnetic energy density.

  • Both electric and magnetic energy densities are zero.

  • Electric energy density is double of the magnetic energy density.

  • Electric energy density is half of the magnetic energy density.


C.

Electric energy density is double of the magnetic energy density.

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2.

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV, and the stopping potential for a radiation incident on this surface 5 V. The incident radiation lies in

  • X-ray region

  • ultra-violet region

  • infra-red region

  • visible region


B.

ultra-violet region

straight lambda space equals space fraction numerator 1242 space eVnm over denominator 11.2 end fraction space almost equal to space 1100 space straight A
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3.

An electromagnetic wave in vaccum has the electric and magnetic fields straight E with rightwards arrow on top and straight B with rightwards arrow on topwhich are always perpendicular to each other. the direction of polarisation is given by straight x with rightwards arrow on top and that of wave propagation by straight k with rightwards arrow on top then

  • straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space straight x space straight E with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space and straight k with rightwards arrow on top vertical line vertical line space straight E with rightwards arrow on top straight x straight B with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line space straight B with rightwards arrow on top space straight X space straight E with rightwards arrow on top

C.

straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top
203 Views