More on waves: inverse square law, decibels, beats, and Doppler

• The inverse square law

How can we handle the extremely wide range of sound-wave intensities that fill our everyday world?

• The decibel system

Let's go back to the problem of adding two waves together. All the cases we've examined so far involves waves with EXACTLY the same frequency.

• What happens when two waves have almost the same frequency?

When either the source or observer is moving, the frequency of waves may change.

• The Doppler effect
  • Yes, yes, the rules for the Doppler effect are slightly different for electromagnetic waves.

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.