1. Notes 21.2: RESONANCE

2. Result of the interference of a reflected wave with the incoming wave.
Standing wave – wave in which parts of the wave appear to be standing still.
Result of the interference of a reflected wave with the incoming wave.
antinode

3. Resonance – when the applied frequency matches the natural frequency of the object; a standing wave builds and gets louder.

4. Fundamental frequency – lowest natural frequency of a vibrating object
Fundamental frequency – lowest natural frequency of a vibrating object. Length (L) = Wavelength (λ)/2
Harmonics – multiples of the fundamental frequency (octaves). Increasing frequencies from 1 to ….

5. Instruments
Stringed instruments – shorter, tighter, thinner strings makes higher frequencies
Woodwind and brass instruments – shorter the air column the higher the pitch.
Timbre –blending of the fundamental frequency with higher harmonics to give an instrument its unique sound.
Middle C on a violin sounds different than Middle C on a guitar.

6. When 2 slightly different frequencies are heard at the same time, beats occur due to interference.
You hear a “wobble” in sound intensity.