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April 1, 2015

April 1, 2015

Posted by **Rohan** on Tuesday, May 14, 2013 at 4:38am.

(a) If you assume that the sun's electromagnetic radiation is a plane sinusoidal wave, what is the magnitude of the electric field in V/m?

(b)What is the magnitude of the magnetic field in T?

(c) What is the time-averaged power (in Watt) radiated by the sun? The mean sun-earth distance is res=1.50×1011m

- Physics to Elena -
**Elena**, Tuesday, May 14, 2013 at 6:06am(a) The time-averaged Poynting vector is

<S> =cε₀E₀²/2.

The amplitude of electric field is

E=sqrt{2<S>/ cε₀} =

=sqrt{2•1.35•10³/3•10⁸•8.85•10⁻¹²} = 1.01•10³ V/m.

(b) The magnetic field is

B₀=E₀/c =1.01•10³/3•10⁸ =3.4•10⁻⁶ T.

(c) The time-averaged power radiated by the Sun at distance R is

<P> =<S>A = <S>4πR² =

=1.35•10³•4π•(1.5•10¹¹)²=3.8•10²⁶W

- Physics to Elena -
**Rohan**, Tuesday, May 14, 2013 at 7:20amthnx Elena :)

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