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NEET2010PhysicsElectromagnetic WavesActual

The electric field of an electromagnetic wave in free space is given by E =10 (10^7 t+k x ) j V / m , where t and x are in seconds and metres respectively. It can be inferred that (1) The wavelength is 188.4 ~m . (2) The wave number k is 0.33 rad / m . (3) The wave amplitude is 10 ~V / m . (4) The wave is propagating along.t x direction Which one of the following pairs of statements is correct?

Options

  1. A(3) and (4)
  2. B(1) and (2)
  3. C(2) and (3)
  4. D(1) and (3)

Correct answer

D. (1) and (3)

Step-by-step solution

The electric field of electromagnetic wave aligned & E =10 (10^7 t kx ) j & Amplitude =10 ~V / m & c = k & 3 10^8= 10^7 k & or k= 1 30 & or 2 = 1 30 & or =188.4 ~m & aligned So, (1) and (3) option are correct.

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