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Electromagnetic Waves:Wavelength, intensit, Amplitude, field

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Sinusoidal electromagnetic wave with f=1.09E10 and field strength of B=1.2E-8T

find: wavelength, Amplitude of Electric field, and Intensity

https://brainmass.com/physics/electricity-magnetism/electromagnetic-waves-wavelength-intensity-amplitude-field-58390

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Sinusodal electromagnetic wave with f=1.09E10 and field strength of B=1.2E-8T find: wavelength, Amplitude of Electric field, and Intensity

The speed of electro magnetic waves is that of the speed of light

c = 3*108 m/s

The wavelength , speed c and frequency f of a traveling wave are related as

c = f.

Hence the wavelength of the wave is given by

 = c / f = 3*108/1.09*1010 = 0.0275 m

The ratio of the amplitudes of the electric and the magnetic components of the wave is the speed c of the wave. Hence

E/B = c
Or E = c*B = 3*108*1.2*10-8 = 3.6 N/C

Intensity of a wave is the rate of energy flow per unit area normal to the wave direction. For electromagnetic waves it is described by Poynting vector S and is given by

as the Electric and magnetic fields are perpendicular to each other in the wave, we can write
Watt m-2.

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