The electric field of an electromagnetic wave in free space is given by 
V/m, where t and x are in seconds and metres respectively. It can be inferred that
(i) the wavelength λ is 188.4 m.
(ii) the wave number k is 0.33 rad/m
(iii) the wave amplitude is 10 V/m
(iv) the wave is propagating along +x direction
Which one of the following pairs of statements is correct ?
Text Solution
Verified by ExpertsD
As given E = 10cos(10 7 t + kx)
Comparing it with standard equation of e.m. wave,
E = E 0 cos( ω t + kx)
Amplitude E 0 =10V/m and ω = 10 7 rad/s
c = νλ = 
or 
= 188.4 m
Also
or 
= 0.033
The wave is propagating along –x direction
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