The rate of energy flow per unit area of an electromagnetic wave has an average value of 0.695 W/m2. The wave is incident at right angles upon a rectangular area measuring 1.5 m by 2.0 m.
How much total energy falls upon this rectangle each minute? (0 = 8.85 10-12 C2/N m2, 0 = 4 10-7 T m/A, c = 3.0 108 m/s)
A) 130 J
B) 160 J
C) 190 J
D) 220 J
E) 250 J
Question 2
If a - particle at rest decays into a neutron and a - , what is the total kinetic energy of the decay products? The masses of -, neutron, and - are 1197 MeV/c2, 940 MeV/c2, and 140 MeV/c2, respectively.
What will be an ideal response?