Sounds waves are compressional waves that travel through a medium and reach the ear. Speed of Sound averages: Air - 343 m/s– about 1 mile every 5 sec Water - 1,498 m/s Steel - 5,960 m/s Speed of Sound: depends on the elasticity, density and temperature Elasticity –Sound travels faster in more elastic objects. Temperature – the higher the temperature the faster the speed of sound. Properties of Sound Intensity – the amount of energy the wave carries Loudness – human perception on intensity. Measured in decibels (dB). Frequency and Pitch Frequency – the number of vibrations per second Human Hearing – between 20 Hz – 20,000 Hz Below 20 Hz is called infrasound Above 20,000 Hz is called ultrasound Pitch - dependent of frequency
High frequency yields high pitch sounds
Low frequency yields low pitch
Natural frequency – every material has a particular frequency at which it will vibrate. Resonance – when the frequency of sound matches the natural frequency of an object.
Doppler Effect- The change in pitch or frequency due to a moving wave source.
Page 1 of 1. Ch 12 Sound Waves Notes Smith 2014. Sounds waves are compressional waves that travel through a medium and reach the ear. Speed of Sound ...
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