6.3.3 Sound Waves

• Sound waves are longitudinal waves where particles vibrate parallel to the direction of wave propagation.

  True
• What factors affect the speed of sound?

  Density and temperature
• Sound travels fastest in solids
• Steps in the production of sound waves

  1️⃣ Object vibrates

  2️⃣ Particles of medium move

  3️⃣ Compressions form

  4️⃣ Rarefactions form
• Rarefactions in sound waves are areas of low pressure
• Match the wave type with its characteristics:

  Mechanical waves ↔️ Require a medium

  Electromagnetic waves ↔️ Do not require a medium
• The wavelength of a sound wave is the distance between two corresponding points
• What is the unit for frequency?

  Hertz
• The amplitude of a sound wave determines its loudness.


  True
• What is the approximate speed of sound in air under normal conditions?

  343 m/s
• The frequency of sound waves is measured in Hertz
• Rank the speed of sound in different mediums from fastest to slowest.

  1️⃣ Solids

  2️⃣ Liquids

  3️⃣ Gases
• What type of waves are sound waves?

  Mechanical
• What are the two types of regions created by sound waves in a medium?

  Compressions and rarefactions
• How is amplitude related to the loudness of sound?

  Directly proportional
• What is the formula for the speed of sound in solids?

  $v =$$\sqrt{\frac{E}{\rho}}$
• What type of waves are sound waves?

  Mechanical
• The speed of sound depends on the type of medium
• What is the speed of sound in steel?

  5,950 m/s
• The speed of sound in air at 20°C is 343 m/s.

  True
• What type of waves are sound waves?

  Mechanical waves
• Unlike light waves, sound waves cannot travel through a vacuum
• What are compressions in sound waves?

  Areas of high pressure
• The frequency of sound waves is measured in Hertz (Hz).

  True
• What is the formula relating frequency and period of sound waves?

  $f =$$\frac{1}{T}$
• What is the formula to calculate the speed of sound in solids?

  $v =$$\sqrt{\frac{E}{\rho}}$
• The speed of sound in gases depends on adiabatic index, pressure, and density
• Sound waves create compressions and rarefactions as they travel through a medium.


  True
• What is the approximate speed of sound in air?

  343 m/s
• Match the sound wave property with its description:

  Speed ↔️ Distance sound travels per unit time

  Wavelength ↔️ Distance between adjacent corresponding points

  Frequency ↔️ Number of wave cycles per unit time

  Amplitude ↔️ Maximum displacement of particles
• The relationship between speed, wavelength, and frequency is given by $v =$$f\lambda$, where v is speed, f is frequency, and \lambda is wavelength.
• What does the symbol 'v' represent in sound wave equations?

  Speed
• The number of complete wave cycles passing a point per unit time is called the frequency
• Speed, wavelength, and frequency are related by the equation $v =$$f\lambda$.


  True
• Amplitude determines the loudness of sound.


  True
• Higher temperature increases particle kinetic energy, facilitating faster vibrations
• Sound waves require a medium to travel.


  True
• The frequency of sound waves is related to the period by the formula $f =$$\frac{1}{T}$, where T is the period
• Rank the speed of sound in different phases of matter from fastest to slowest.

  1️⃣ Solids

  2️⃣ Liquids

  3️⃣ Gases
• In gases, the speed of sound depends on the adiabatic index, pressure, and density