Sound

3.2.5 Electromagnetic spectrum

4.1 Simple phenomena of magnetism

Sound

  1. Physical attributes

    1. Sound is produced by vibrating sources that cause the surrounding medium to vibrate accordingly
    2. Sound is a longitudinal wave
    3. An area where particles are compressed together is called a compression
    4. An area where particles are far apart is called a rarefaction
    5. A medium is needed to transmit sound waves

  2. Speed of sound

    1. The speed of sound can be obtained experimentally by timing the echo from a plane a known distance from the sound, and using the formula speed of sound = 2â‹…distance to planetime to hearing echo
    2. The speed of sound in air is lower than in liquids, which is lower than in solids

  3. Audition

    1. The approximate range of audible frequencies is 20-20,000 Hertz
    2. The loudness of a sound rises with the amplitude of the sound wave
    3. The pitch of a sound wave rises with the frequency of the sound wave
    4. The reflection of sound produces an echo, which can be perceived if it returns with sufficient amplitude and volume