The energy density of an electromagnetic wave in free space is
A) entirely in the electric field.
B) entirely in the magnetic field.
C) 1/4 in the electric field and 3/4 in the magnetic field.
D) 1/4 in the magnetic field and 3/4 in the electric field.
E) equally divided between the magnetic and the electric fields.
E
You might also like to view...
A cyclical process that transfers energy as heat from a high temperature reservoir to a low temperature reservoir with no other change would violate:
A. the zeroth law of thermodynamics B. the first law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. none of the above
A crate of grapes lifted 10 meters gains 200 J of potential energy. If the same crate is instead lifted 20 meters, its gain in potential energy is
A) half as much. B) the same. C) twice as much. D) four times as much. E) more than four times as much.
In the view of the science of the 17th, 18th, and 19th centuries, the natural world
A) cannot be investigated by scientific methods. B) is similar to a living organism. C) is similar to a clock. D) is not real. E) has a sort of free will of its own.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is 5 m/s2
Indicate whether the statement is true or false