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Electromagnetic Waves One Mark Questions

12th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 10
    5 x 1 = 5
  1. Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is _____.

    (a)

    1 m

    (b)

    10 m

    (c)

    100 m

    (d)

    1000 m

  2. The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.

    (a)

    \(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)

    (b)

    \(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

    (c)

    \(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

    (d)

    \(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)

  3. In an electromagnetic wave traveling in free space the rms value of the electric field is 3 V m−1. The peak value of the magnetic field is _____.

    (a)

    1.414 x 10-8 T

    (b)

    1.0 x 10-8 T

    (c)

    2.828 x 10-8 T

    (d)

    2.0 x 10-8 T

  4. Electromagnetic waves are produced by _____________.

    (a)

    static charge

    (b)

    moving charge

    (c)

    an accelerating charge

    (d)

    chargeless particles

  5. Which of the following electromagnetic waves has the highest frequency?

    (a)

    radio waves

    (b)

    micro waves

    (c)

    X- rays

    (d)

    ૪-rays

  6. 5 x 1 = 5
  7. U- V Radiation

  8. (1)

    6 x 10-10m to 4 x 10-7m

  9. Continuous Emission spectra

  10. (2)

    Incandescent solids

  11. Band Emission spectra of H, gas

  12. (3)

    Solar spectrum

  13. Line Absorption spectra

  14. (4)

    Spectra of H2 gas

  15. Fraunhofer Lines

  16. (5)

    Spectrum of Carbon Arc

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