Sound waves are longitudinal waves Loudness is connected to the amplitude – Larger amplitude means louder sound Pitch is connected to frequency and wavelength – Higher pitch means Higher frequency Shorter wavelength Graph air pressure vs. position to represent a sound wave.

Wave speed frequency wavelength Wave speed does NOT depend on frequency and wavelength, although we can calculate it using f and λ.

wavelength Length of spring # of antinodes

Resonance

Resonance occurs when an object vibrates at certain frequencies (particular to that object) and amplitudes much larger than the original vibrations occur. – Standing wave on a spring – Swing at the park