Question

A plane electromagnetic wave varies sinusoidally at 98.2 MHz as
it travels through vacuum along the positive *x* direction.
The peak value of the electric field is 2.10 mV/m, and it is
directed along the positive *y* direction.

(a) Find the wavelength.

m

(b) Find the period.

ns

(c) Find the maximum value of the magnetic field.

pT

(d) Write expressions in SI units for the space and time variations
of the electric field. (*x* is in meters, and *t* in
seconds.)

magnitude | E = ( ) cos
2π( x − t) |

direction | ---Select--- +x −x +y −y +z −z |

Write expressions in SI units for the space and time variations of
the magnetic field. (*x* is in meters, and *t* in
seconds.)

magnitude | B = ( ) cos
2π( x − t) |

direction | ---Select--- +x −x +y −y +z −z |

(e) Find the average power per unit area this wave carries through
space.

W/m^{2}

(f) Find the average energy density in the radiation.

J/m^{3}

(g) What radiation pressure would this wave exert upon a perfectly
reflecting surface at normal incidence?

Pa

Answer #1

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