A plane electromagnetic wave, with wavelength 2.5 m, travels invacuum in the positive direction of an x axis. The electric field,of amplitude 370 V/m, oscillates parallel to the y axis.

(g) If the wave falls on a perfectly absorbing sheet of area 2.6m2, at what rate would momentum be delivered to the sheet and whatis the radiation pressure exerted on the sheet?

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An electromagnetic wave of wavelength 435 nm is traveling in a vacuum in the –z direction. The electric field has an amplitude of 2.70 x 10^-3 V/m and is parallel to the x-axis. What are the frequency and the magnetic-field amplitude of this wave?

blackdolphin399

A plane electromagnetic wave varies sinusoidally at 90.0 MHz as its travels through vacuum along the positive x direction. The peak value of the electric field is 2.00 mV/m, and it is directed along the positive y direction. Find (a) the wavelength, (b) the period, and (c) the maximum value of the magnetic field. (d) write the expression in SI units for the space and time variations of the electric field and of the magnetic field. Include both numerical values and unit vectors to indicate direction. (e) find the average power per unit area this wave carries through space. (f) find the average energy density in the radiation (in joules per cubic meter) (g) what radiation pressure would this wave exert upon a perfectly reflecting surface at normal incidence?

erinrhinoceros274

2. A sheet of current lies in the xz plane as shown. A surfacecurrent K is applied along the z axis which alternates sinusoidallyat a frequency f. i.e. K=K0sin(2(pi)ft)

Consider regions close to the surface where the plane of currentappears of infinite extent. Plane electromagnetic waves travel awayfrom the sheet in both the positive and negative ydirections.

(a) In what axis will be the electric field vector?

(b) In what axis will be the magnetic field vector?

(c) Write down an expression for the electric field component ofthe wave travelling in the positive y direction. Use Ampereâs Lawto make an estimate for the magnitude of the wave. Consider thesigns of the waves.

(d) Write down an expression for the magnetic field component ofthe wave travelling in the opposite direction.

(e) Consider the wave travelling in the positive y direction. Whatis the Poynting vector for this wave? What is the intensity of thiswave?

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