Sound waves - Waves

Sound waves

Lessons

Notes:

In this lesson, we will learn:

  • The nature of sound waves
  • How to solve problems relating frequency, wavelength, velocity, pitch, and loudness.
  • Physical properties of sound
  • Doppler shift and applications

Notes:

  • Sound is produce by vibration of molecules.
  • As the result of collision of molecules, the pressure is transmitted away form the source.
  • Amplitude of sound is the measure of the variation in pressure, in other words Loudness, the louder sound has higher amplitude and more energy.
  • The amplitude is measured by a scale called Sound Level.
  • Sound level is measured in decibels (dB).
  • Pitch:the sensation of frequency, high pitch high frequency.

Sound waves

  • Speed of sound wave changes upon change in temperature, the higher the temperature the higher the speed.
  • Sound can travel through solids, liquids and gases. (Highest speed in solids)
  • Sound can NOT travel through vacuum (No particles to move and collide).
  • Sound waves are characterized as longitudinal waves.
  • Echoes: Reflected sound waves.
  • Doppler shift: due to motion of the sound source or the observer, the detected frequency changes. The frequency of the source does NOT change.
  • Intro Lesson
    Sound waves
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Sound waves

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