Water Waves and Light Waves
Most recent answer: 06/04/2015
Q:
Suppose I drop a pebble in a pond, causing a wave. I next drop a small twig on the wave. The twig can ride the wave and move outwards. Similarly, why does an electron NOT move under the influence of the electric field associated with a light wave?
- Sandeep Sharma (age 39)
Dallas, TX
- Sandeep Sharma (age 39)
Dallas, TX
A:
Hello Sandeep,
Unless the water wave is nonlinear like a tsunami, the twig will simply bounce up and down and not be transported. An electron can be moved by an incident light wave; consider the photo-electric effect as an example where an electron is ejected from an atom.
LeeH
The electron will wiggle back and forth in the electric field and also be pushed a little in the direction the light wave is going by the radiation pressure from the combined electric and magnetic fields. mw
(published on 06/04/2015)