Instructor: Dr. Bruce Law, CW
327, Tel: 532-1618.
E26.10. Sound requires a physical medium to travel in. Light can travel through a vacuum, for example, the space between the Sun and the Earth is an excellent vacuum.
E26.11. Radio waves travel at the speed of light.
E26.13. Radio waves and light are both “electromagnetic waves” which travel at the speed of light. Radio waves have a much larger wavelength and smaller frequency than light.