Answers to Selected Problems - West Valley College

Problem Sets Physics 4D
How many photons/s are contained in a beam of electromagnetic radiation of total power 150W if the
source is an
a) AM radio station of 1100 kHz,
b) 8.0 nm x-rays, and
c) 4.0 MeV gamma rays?
Answer(s)
a) 2.06 x 10 29
b) 6.05 x 10 18
c) 2.34 x 10 14
Melvin J. Vaughn Page 42 of 61 West Valley College