Waves

• What do waves transfer from one place to another?

  Energy
• Do waves transfer matter?

  No, they do not transfer matter
• How does our brain interpret energy from waves?

  By building images and tunes
• What do waves do as they travel?

  They vibrate or oscillate
• In a displacement-distance graph, what does distance represent?

  How far the wave has traveled
• What is the maximum displacement of a wave called?

  Amplitude
• What is the distance of one entire oscillation called?

  Wavelength
• What is the opposite of the crest in a wave?

  Trough
• What does a displacement-time graph show?

  Time on the x-axis instead of distance
• What is the time period of a wave?

  Time for one complete oscillation
• What is the wave speed of a sound wave with a frequency of $400 \text{ Hz}$ and a wavelength of $70 \text{ cm}$?


  $280 \text{ m/s}$
• How do you calculate frequency from the time period?

  Frequency = 1 / time period
• If the time period is $0.5 \text{ seconds}$, what is the frequency?


  2 Hz
• If the frequency is $4 \text{ Hz}$, what is the time period?


  $0.25 \text{ seconds}$
• How do you calculate wave speed?

  Wave speed = wavelength × frequency
• What are transverse waves?

  Oscillations are perpendicular to energy transfer
• What are longitudinal waves?

  Oscillations are parallel to energy transfer
• What happens in longitudinal waves?

  Regions become more spread out and compressed
• What is the main takeaway from the video?

  Basics of waves and their properties
• What is the definition of oscillation in the context of waves?

  Repetitive back and forth movement
• Why is energy transfer important in waves?

  It allows communication and information transfer
• What does amplitude indicate in a wave?

  Maximum displacement from equilibrium
• How are wave speed, frequency, and wavelength related?

  Wave speed = frequency × wavelength
• What are compression and rarefaction in longitudinal waves?

  Regions of high and low pressure