The sun has apparent brightness B at the earth, which is 1.5 108 ...

[ishan]

The sun has apparent brightness B at the earth, which is 1.5  108 km away.
 
  What would be the apparent brightness of the sun at Pluto, which is 6.0  109 km from the sun?
  A) 0.063 B B) 0.00063 B C) 0.025 B D) 0.25 B

Question 2

The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m2.
 
  What is the maximum value of the magnetic field in the wave? (c = 3.00  108 m/s, 0 = 4  10-7 T  m/A, 0 = 8.85  10-12 C2/N  m2 )
  A) 3.55  10-8 T B) 7.09  10-8 T C) 9.81  10-8 T D) 1.42  10-7 T E) 5.02  10-8 T

[Tonny]

Answer to Question 1

B

Answer to Question 2

B

[ishan]

Wow, this really help

[ricroger]

Excellent