Electromagnetic Waves Two Marks Questions

12th Standard EM

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
    15 x 2 = 30
  1. What is displacement current?

  2. What are electromagnetic waves?

  3. Write down the integral form of modified Ampere’s circuital law.

  4. Explain the concept of intensity of electromagnetic waves.

  5. What is meant by Fraunhofer lines?

  6. Write the uses of Radio waves.

  7. Write the uses of Micro waves.

  8. (i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and
    (ii) Do Electromagnetic waves carry energy and momentum?

  9. (i) In which situation is there a displacement current but no conduction current?
    (ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.

  10. Arrange the Electromagnetic waves in order of
    (i) increasing frequency
    (ii) decreasing wavelength.

  11. Why are Infra~ed radiation referred as heat waves? Name the radiations, which are next to these radiation having
    (i) shorter λ
    (ii) longer λ.

  12. Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

  13. Which part of Electromagnetic is absorbed from sunlight by ozone layer?
    (i) Write its source and
    (ii) mention its uses.

  14. Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.

  15. What is the orgin of displacement currtent?

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