Warm-Up Exercise 20

Due 12:15 pm, Fri 12 Oct 2012

Physics 123, Fall 2012

Reading assignment: 18.4-18.7

The boundary conditions for waves on a string with two fixed ends leads to a fundamental mode which looks like half a sine wave, oscillating up and down. But what happens if one end is fixed and the other is free to move? What would the fundamental mode look like for that case?

In the context of waves, what is "beating" and why does it occur? Explain in your own words, as if to someone who is not familiar with physics.

Give an example of resonance from everyday life.