Mechanical Waves Mechanical Wave

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2) Intensity --> rate at which a wave‛s energy flows through a given area; depends on both the wave‛s amplitude & distance from the sound source. Intensity is measured in decibels. For every 10 decibel increase, the intensity increases tenfold Sound Intensity level(decibels) Human Hearing threshold 0 Whisper 1520 Normal conversation 4050 Street noise 6070 Inside a bus 90100 Operating heavy machinery 80120 Rock concert 110120 Threshold of pain 120 Jet plane taking off 120160 22
3) Loudness --> physical response to the intensity of sound; is subjective as it depends on ear health and brain interpretation 4) Pitch --> how the frequency of sound is perceived; remember that frequency is how fast the wave is vibrating. High pitch sounds have a high frequency. Low pitch sounds have a low frequency. Humans typically hear between 20-20,000 hertz. Ultrasound --> frequencies greater than 20,000 hertz; beyond range of human hearing. Sonar = SOund NAvigation & Ranging; uses the speed of sound in water and the time that the sound takes to reach an object and the bounce back from the object (echo); also called echolocation; uses ultrasound frequencies. 23
Page 1 and 2: CH 17 - MECHANICAL WAVES & SOUND Se
Page 3: 2) LONGITUDINAL WAVE- a wave in whi
Page 6 and 7: Sec. 17.2 - PROPERTIES OF MECHANICA
Page 8 and 9: Amplitude - maximum displacement of
Page 10 and 11: Try these: 1) The waves in a pool h
Page 12 and 13: Sec. 17.3 - BEHAVIOR OF WAVES 1) RE
Page 14 and 15: 3) DIFFRACTION - Bending of a wave
Page 16: Chromatic interference is seen in s
Page 19 and 20: v ANTINODE - point on standing wave
Page 21: Sec. 17.4 - Sound & Hearing Sounds
Page 25 and 26: Doppler Effect --> a change in soun
Page 28 and 29: How human hearing works: 1) The pin
Page 30 and 31: Large-diameter speakers are better

Mechanical Waves Mechanical Wave

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