Question 138: EM waves

Question

The mean intensity of radiation on the surface of the Sun is about 10
8
W/m
2
. The rms value of the corresponding magnetic field is closet to :

Accepted Answer

I = $${\varepsilon _0}\,C\,E_{rms}^2$$
&  E
rms
= cB
rms
I = $${\varepsilon _0}$$ C
3
B$$_{rms}^2$$
B$$_{rms}$$ = $$\sqrt {{{\rm I} \over {{ \in _0}{C^3}}}} $$
B
rms
$$ \approx $$ 10
$$-$$4

Answer

10
2
T

Answer

10
$$-$$2
T

Answer

10
$$-$$4
T

Answer

1 T

EM waves

The mean intensity of radiation on the surface of the Sun is about 10 8 W/m 2 . The rms value of the corresponding magnetic field is closet to :

Choose the correct answer: