P2 waves

• What type of sound waves are there?

  Longitudinal
• What is the audible range of frequencies for humans?

  Between 20 - 20000 Hz
• How can you measure the velocity of sound in air?

  • Echo clap method: clap, record echo time.
  • Sound over distance: use timer for large distances.
  • Two microphones: record time difference of sound.
• How does sonar work?

  Ultrasound waves reflect off boundaries, echoes detected
• What equation is used to find distance in sonar?

  Distance = speed x time
• How does ultrasound scanning work?

  Ultrasound waves reflect off organs to create images
• What is the safety aspect of ultrasound?

  It does not damage cells
• Which property of sound waves describes loudness?

  Amplitude
• How does amplitude affect sound?

  Higher amplitude means louder sound
• Which property of sound waves describes pitch?

  Frequency
• How does frequency affect pitch?

  Higher frequency means higher pitch
• What letter represents wavelength in sound waves?

  D
• What letter represents amplitude in sound waves?

  A