easy question want to make sure of my answers Electromagnetic radiation from the

Question

easy question

want to make sure of my answers

Electromagnetic radiation from the Sun reaches the Earth (above the atmosphere) at a rate of about 1350 J/(s.m^2) (= 1350 W/m^2). (a) Assume that this is a single EM wave, calculate the maximum values of E and B. (b) Let this hit a house roof. The area is 10m x 15 m = 150m^2. Obtain the total power striking the roof, in watts. (c) Obtain the total energy in 1 hour hitting the roof. (d) Obtain the PRESSURE acting on the roof from the EM wave. (e) What?s the average force over the entire roof.

Explanation / Answer

a)assuming single elctromagnetic wave

E=square root of (2*I/EPSILON*C)

C=velocity of light

=3*10^8m/s

I=RADIATION FROM SUN=1350W/M2

1.01*10^3 V/M

MAXIMUM MAGNETIC FIELD

B=E/C

=0.336*10^-5

b)in the given question radiation comes at the rate of 1350W/m2

so total power=1350*area

=1350*150

=202.5 kilowatts

c)

to calculate energy use formula that is

power*time

202.5*1

=202.5KWH

d)pressure acting on the roof from EM wave is

P=I/C

=450*10^-8 n/m2

e)

AVERAGE FORCE

F=P*A

=450*10^-8*150

=675*10^-6 N

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