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Ultrasound: sound too high in frequency for humans to hear

        

Use: Sonar

Velocity: 2 ways to determine

  1. see how D changes over time
  2. the Soppler effect

why ultrasound?

Applications:

Infrasound: Frequency is too low to hear

        ex. Earthquake

CH. 3  STANDING WAVE

Standing wave: wave that is not moving

The sum result of the constructive and destructive interferences is a stationary wave with

Standing waves in strings

Harmonic

λ

f

1

2

3

n

Terminology: 1st Harmonic sometimes called the fundamental

                Anything over that is called an overtone