The electric field of an electromagnetic wave in free space is given by E→=10 cos107t+kxj^ V/m, where t and x are in seconds and metres respectively. It can be inferred that1) the wavelength λ is 188.4 m2) the wave number k is 0.33 rad/m.3) the wave amplitude is 10 V/m.4) the wave is propagating along + x direction.Which one of the following pairs of statements is correct ?

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(3) and (4)

(1) and (2)

(2) and (3)

(1) and (3)

answer is D.

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Detailed Solution

Wavelength λ ; Given ω = 107 rad / secλ=Cn=3 x 108ω2π=3 x 1081072π=30 x 2π=188.4 mAmplitude of electric field = 10 V/m

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