Production of Electromagnetic Waves Summary
- Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation.
- Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.
- The strengths of the electric and magnetic parts of the wave are related by
which implies that the magnetic field \(B\) is very weak relative to the electric field \(E\).
a vector quantity (E); the lines of electric force per unit charge, moving radially outward from a positive charge and in toward a negative charge
electric field strength
the magnitude of the electric field, denoted E-field
a vector quantity (B); can be used to determine the magnetic force on a moving charged particle
magnetic field strength
the magnitude of the magnetic field, denoted B-field
a wave, such as an electromagnetic wave, which oscillates perpendicular to the axis along the line of travel
a wave that oscillates in place, with nodes where no motion happens
the distance from one peak to the next in a wave
the height, or magnitude, of an electromagnetic wave
the number of complete wave cycles (up-down-up) passing a given point within one second (cycles/second)
a system that displays enhanced oscillation when subjected to a periodic disturbance of the same frequency as its natural frequency
to fluctuate back and forth in a steady beat