1. For a given incident energy of electromagnetic wave, why is the radiation pre
ID: 1401376 • Letter: 1
Question
1. For a given incident energy of electromagnetic wave, why is the radiation pressure on a perfect reflecting surface twice as large as the pressure on a perfect absorbing surface? 2. What is the fundamental source of electromagnetic radiation? 3. Does a wire connected to a battery emit an electromagnetic wave? Explain. 4. The figure shows a plane electromagnetic sinusoidal wave propagating in the x direction. The wavelength is 50m, and the electric field vibrates in the xy plane with an amplitude of 22 V/m. Calculate: a) The sinusoidal frequency b) The magnitude and direction of B when the E has its maximum value in the negative y direction c) Write an expression for B in the form B = Bm cos(kx - Ohm t) 5. What is the average magnitude of the Poynting vector at a distance of 5 miles from an isotropic radio transmitter, broadcasting with average power of 250 kW?Explanation / Answer
2.The fundamental source of electromagnetic radiation is vibrating electric charges, which emit vibrating electric and magnetic fields.As we know that stationary charges produce only electric fields and charges in uniform motion produces electric and magentic fields. The charges that are accelerated produce electric and magnetic fields and electromagnetic fields.
3.No, because the charges that are accelerated produce electric and magnetic fields and electromagnetic fields.Here in a battery a steady state currrent will pass through it
5.
The averge magnitude of pointing vector is given by
S =P/4pir2
P =250*103W
r =5miles =8046.72m
1mile =1.6093km
Therefore S =250*103W/4*3.14*(8046.72m)2=3.074*10-4W/m2
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