Waves Direction Chapter 14 Sound Physics Notes - Edubirdie

University:
University of Cambridge
Course:
0625 IGCSE | Physics
Academic year:

2023
Views:

390

Pages:

2
Author:

Deddy A.

The two waves don't have to be going in the same direction! When the pulses overlap, as in parts (b), (c), and (d), the net displacement of the string equals the sum of the displacements produced by each pulse. Figure 13.32 Two wave pulses travelling on a stretched string in opposite directions pass through each other. When the pulses overlap, as in part (c), their displacements subtract from each other. Figure 13.33 Two wave pulses travelling in opposite directions with inverted displacements relative to each other. Chapter 14 Sound Sound waves are longitudinal waves generated by vibrations in a medium, such as air/water As the hand pumps back and forth, compressed regions alternate stretched regions both in space and time. Compressed Compressed ! Stretched rarefaction. Compression Longitudinal wave Stretched region of high molecular density air pressure region of reduced density Categories of Sound Waves Audible waves (to humans) 20-20,000 Ha Infrasonic (audible to elephants and whales) below human ear range below-20 Hz. Ultrasonic (audible to bats) - above-20,000 Hz Speed of Sound elastic property Vinertial property for gases Infrasound Audible range Ultrasound 20Hz 20kHz B is COMPRESSIBILITY, p is GAS DENSITY The speed of sound in a gas depends on the temperature: speed is higher in solids b/c more. Molecular interactions. 2011 273 = 331 m/s for air INC temp. here faster

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