melinda.mendoza
melinda.mendoza Jan 1, 2026 β€’ 9 views

grade 11 physics sound waves quiz

Hey there! πŸ‘‹ Getting ready for your Grade 11 physics sound waves quiz? Don't stress! I've got a quick study guide and practice quiz to help you ace it. Let's dive in! 🌊
βš›οΈ Physics

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sarahward1987 Dec 26, 2025

πŸ“š Quick Study Guide

  • πŸ” Sound Waves: Longitudinal waves that travel through a medium (solid, liquid, or gas).
  • πŸ“ˆ Speed of Sound: Depends on the medium's properties (temperature, density, elasticity). In air, it's approximately $343 \text{ m/s}$ at $20^\circ \text{C}$.
  • 🌊 Wavelength ($\lambda$): The distance between two consecutive compressions or rarefactions.
  • ⏱️ Frequency (f): The number of complete waves that pass a point per second, measured in Hertz (Hz).
  • πŸ“’ Amplitude: The maximum displacement of particles from their rest position; related to the loudness of the sound.
  • βž— Wave Equation: Relates speed (v), frequency (f), and wavelength ($\lambda$): $v = f\lambda$.
  • πŸ”Š Intensity (I): Power per unit area; measured in $\text{W/m}^2$.
  • πŸ‘‚ Decibel Scale (dB): Measures sound intensity level: $\text{dB} = 10 \log_{10} (\frac{I}{I_0})$, where $I_0$ is the threshold of hearing ($10^{-12} \text{ W/m}^2$).
  • βž• Doppler Effect: Change in frequency due to relative motion between the source and the observer.

πŸ§ͺ Practice Quiz

  1. Question 1: What type of wave is a sound wave?
    1. Longitudinal
    2. Transverse
    3. Electromagnetic
  2. Question 2: What is the approximate speed of sound in air at $20^\circ \text{C}$?
    1. $300 \text{ m/s}$
    2. $343 \text{ m/s}$
    3. $400 \text{ m/s}$
  3. Question 3: Which property of a sound wave is related to its loudness?
    1. Frequency
    2. Wavelength
    3. Amplitude
  4. Question 4: The distance between two consecutive compressions in a sound wave is called:
    1. Frequency
    2. Wavelength
    3. Amplitude
  5. Question 5: What is the unit of frequency?
    1. Meter
    2. Hertz
    3. Decibel
  6. Question 6: Which of the following factors does *not* affect the speed of sound in a medium?
    1. Temperature
    2. Density
    3. Color
  7. Question 7: What happens to the observed frequency of a sound wave if the source is moving towards the observer?
    1. Increases
    2. Decreases
    3. Remains the same
Click to see Answers
  1. A
  2. B
  3. C
  4. B
  5. B
  6. C
  7. A

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