6.3.3 Sound Waves

• What type of waves are sound waves?

  Longitudinal
• Rarefactions in sound waves are regions of low pressure
• What happens to the particles in a medium as sound waves pass through it?

  They oscillate
• What is the definition of rarefactions in sound waves?

  Areas where particles are spread apart
• Steps in the production of sound waves

  1️⃣ Vibrating Object

  2️⃣ Compression

  3️⃣ Rarefaction

  4️⃣ Propagation
• Higher frequency sound waves have a higher pitch.

  True
• In which medium does sound travel faster?

  Solids
• The frequency of a sound wave is measured in Hertz
• How is the frequency of a sound wave related to its pitch?

  Higher frequency = higher pitch
• A shorter wavelength in a sound wave corresponds to a higher pitch.

  True
• The amplitude of a sound wave determines its loudness
• What happens to the loudness of a sound wave if its amplitude increases?

  Sound becomes louder
• Sound travels faster in solids than in air.


  True
• What does the speed of a sound wave depend on?

  The medium it travels through
• Sound waves are examples of longitudinal
• Sound waves transmit energy through compressions and rarefactions.

  True
• What are the regions of high pressure in a sound wave called?

  Compressions
• In a sound wave, compressions are areas of high pressure
• What do sound waves carry through a medium without transporting particles over long distances?

  Energy
• Sound waves are produced by vibrating objects
• Steps in the production of sound waves

  1️⃣ Vibrating Object

  2️⃣ Compression

  3️⃣ Rarefaction

  4️⃣ Propagation
• How is the wavelength of a sound wave related to its pitch?

  Shorter wavelength = higher pitch
• The amplitude of a sound wave is related to its loudness
• Sound travels faster through solids because they have higher elasticity.


  True
• Match the factor affecting sound speed with its influence:

  Density ↔️ Slower in denser media

  Elasticity ↔️ Faster in more elastic media

  Temperature ↔️ Faster at higher temperatures

  Phase ↔️ Fastest in solids, slowest in gases
• Why does sound travel faster through steel than water?

  Steel has higher elasticity
• In longitudinal waves, particle motion is parallel to the direction of wave travel.


  True
• Sound waves are examples of longitudinal
• What type of wave is a water wave?

  Transverse
• Longitudinal waves can travel through solids, liquids, and gases.


  True
• What conditions are necessary for sound waves to reflect off a surface?

  Smooth, rigid surface
• In sound wave reflection, the angle of reflection is equal to the angle of incidence
• The wavelength of the sound wave must be much smaller than the reflecting surface for reflection to occur.


  True
• The surface for sound wave reflection must be smooth and rigid
• The angle of reflection for sound waves is equal to the angle of incidence.

  True
• What type of surface is required for sound wave reflection?

  Smooth and rigid
• Vibrating vocal cords are an example of sound wave production.

  True
• What are the primary factors affecting the speed of sound?

  Density, elasticity, temperature, phase
• Sound travels faster through air than through steel.

  False
• Sound travels faster at higher temperatures