Chapter 10 & 11

Elasticity, Oscillations,

Waves, and Sound




Beats occur when waves of slightly different frequencies interfere.





Standing Waves

Standing waves are formed when two waves having the same frequency, amplitude, and wavelength travel in opposite directions through a medium.


Standing waves in a string:





Example 24

One of the harmonics on a string 1.30 m long has a frequency of 15.60 Hz. The next higher harmonic has a frequency of 23.40 Hz. Find (a) the fundamental frequency, and (b) the speed of waves on this string.



The fundamental frequency is the difference between the given frequencies:

Find the speed:

On to Sound Part 5