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Chapter 16: Sound

Chapter 16: Sound. Section 3: Intensity determines loudnes s . Intensity (loudness) depends on the amplitude of the sound wave. Amplitude/intensity measure how much energy is in a wave.

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Chapter 16: Sound

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  1. Chapter 16: Sound Section 3: Intensity determines loudness.

  2. Intensity (loudness) depends on the amplitude of the sound wave • Amplitude/intensity measure how much energy is in a wave • The greater the intensity, amplitude, or energy, the louder the sound (ex: the harder you hit a drum the louder it sounds). • Sound is measured in units called decibels • As a sound wave travels it ‘loses’ energy because of friction with the medium and gets softer.

  3. The intensity of sound can be controlled • Amplification: increasing the strength of a sound to make it louder (your stereo has an amplifier). • Acoustics: the scientific study of sound. Ex: movie theaters have soft fabric on the walls to absorb sound waves. Concert halls are shaped to direct sound waves to the audience.

  4. Intense sound can damage hearing. • Listening to loud sounds (over 90 dB) can damage the tiny hairs in the cochlea and cause your hearing to be damaged. • Being around a super loud sound (over 130 dB) just once could damage your hearing, so be careful! • There are pictures of healthy and damaged hair cells on pg. 536 of your book. • On pg. 534 you can see approximate sound intensities for sounds you might encounter during a normal day.

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