The wave equation

• What should you be able to do by the end of the video?

  Use the wave equation to calculate wave speed
• What are the three important properties of waves discussed?

  Amplitude, wavelength, and frequency
• What is the definition of amplitude?

  Farthest point from undisturbed position
• How is wavelength defined?

  Distance from one wave point to the next
• What is the unit of frequency?

  Hertz
• How many waves correspond to one Hertz?

  One wave per second
• What does wave speed represent?

  Speed at which energy is transferred
• How can wave speed be calculated?

  Wave speed = frequency × wavelength
• Is the wave speed equation provided in the exam?

  No, you need to learn it
• What is the wave speed if frequency is 165 Hertz and wavelength is 2 meters?

  330 meters per second
• What is the first step to calculate wave speed with a frequency of 10,000 Hertz and a wavelength of 2 centimeters?

  Convert 2 centimeters to meters
• What is the wavelength in meters for 2 centimeters?

  0.02 meters
• What is the wave speed for a frequency of 10,000 Hertz and a wavelength of 0.02 meters?

  200 meters per second
• How do you calculate wavelength if wave speed is 500 meters per second and frequency is 200 Hertz?

  Divide wave speed by frequency
• What is the wavelength if wave speed is 500 meters per second and frequency is 200 Hertz?

  2.5 meters
• What is a method to measure the speed of sound waves in air?

  • Two people separated by 500 meters
  • Person A clashing cymbals
  • Person B timing from seeing clash to hearing sound
  • Calculate speed using distance and time
• What are the problems with the cymbals experiment?

  Reaction time and short sound delay
• How can reaction time errors be reduced in the experiment?

  Use multiple observers with timers
• How can the short time delay issue be addressed?

  Increase the distance between observers
• What should you practice for the exam regarding waves?

  • Wave equation questions
  • Speed of sound measurement methods