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Quizzes > Science

Waves Unit Test: Sound, Properties, and Equations

Quick, free sound waves quiz to check your understanding. Instant results.

Editorial: Review CompletedCreated By: Ratih MayyuanaUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
paper art waves quiz graphic showing amplitude waveform wavelength curves and wave equations on coral background

This waves unit test helps you check key sound wave ideas like amplitude, wavelength, frequency, and basic equations across different materials. Get quick feedback, then strengthen weak spots with a focused sound wave test, a broad physics waves quiz, and deeper practice on refraction in waves.

What is the term for the distance between two consecutive crests of a wave?
Amplitude
Wavelength
Frequency
Period
The wavelength is the distance between two successive crests or troughs of a wave. It determines the spatial period of the wave and is usually measured in meters. Understanding wavelength is essential for analyzing wave behavior in physics. .
What does the amplitude of a sound wave represent?
The number of oscillations per second
The medium through which it travels
The maximum displacement from equilibrium
The speed of the wave
Amplitude is the maximum displacement of particles from their equilibrium position in a wave. In sound waves, larger amplitudes correspond to louder sounds because more energy is delivered per oscillation. It does not affect the frequency or speed of the wave. .
Which equation correctly relates wave speed (v), frequency (f), and wavelength (?)?
E = h × f
v = d / t
F = m × a
v = f × ?
The fundamental wave relationship is v = f × ?, where v is the wave speed, f is the frequency, and ? is the wavelength. This formula applies to all types of linear waves, including sound, light, and water waves. It shows that speed increases if either frequency or wavelength increases. .
In which type of wave do particles of the medium oscillate parallel to the direction of wave travel?
Electromagnetic wave
Surface wave
Longitudinal wave
Transverse wave
In a longitudinal wave, particles move back and forth parallel to the direction of wave propagation. Sound waves in air are classic examples of longitudinal waves. In contrast, transverse waves have particle motion perpendicular to wave travel. .
If a sound wave has a frequency of 500 Hz and travels at 340 m/s, what is its wavelength?
680 m
1.47 m
0.68 m
170 m
Wavelength ? is calculated by ? = v / f. Substituting v = 340 m/s and f = 500 Hz gives ? = 340/500 = 0.68 m. This shows how shorter wavelengths correspond to higher frequencies at a constant speed. .
What is the period of a 200 Hz wave?
200 s
0.02 s
0.005 s
5 s
The period T is the reciprocal of frequency: T = 1/f. For f = 200 Hz, T = 1/200 = 0.005 s. The period represents the time for one complete oscillation. .
How does increasing the amplitude of a sound wave affect its characteristics?
Increases loudness
Increases frequency
Increases wavelength
Increases wave speed
Increasing the amplitude of a sound wave increases the energy carried by the wave, which we perceive as louder sound. It does not change the frequency or speed in a given medium. Amplitude is directly related to the sound pressure level. .
Sound travels fastest in which of the following media?
Steel
Water
Vacuum
Air
Sound requires a medium and travels fastest in solids because particles are closer together, allowing quicker transmission of vibrations. Steel conducts sound faster than liquids and gases. No sound travels in a vacuum. .
The intensity of a sound wave is proportional to the square of its which property?
Wavelength
Amplitude
Frequency
Period
Intensity is proportional to the square of the amplitude because it reflects the energy transmitted per unit area. Doubling amplitude quadruples intensity. Frequency and wavelength affect pitch and speed but not intensity directly. .
In a standing wave on a string, nodes are points of:
Maximum energy transfer
Zero displacement
Maximum particle velocity
Maximum amplitude
Nodes in a standing wave are points where destructive interference causes zero net displacement. Antinodes are where the amplitude is maximal. Standing waves form due to the superposition of two waves traveling in opposite directions. .
Two waves of equal amplitude and frequency traveling in the same medium are out of phase by 180°. What occurs when they meet?
Constructive interference
They pass through unaffected
Beat formation
Destructive interference
When two waves are out of phase by 180°, their displacements cancel, resulting in destructive interference. The net amplitude at those points is zero. If phase difference is different, partial cancellation or enhancement occurs. .
On the decibel scale, an increase of 10 dB corresponds to what change in intensity?
A hundredfold increase in intensity
No change in intensity
A tenfold increase in intensity
A doubling of intensity
The decibel scale is logarithmic; a 10 dB increase means the intensity is multiplied by 10. Each 10 dB step represents a tenfold change in power or intensity. This scale helps manage the wide range of human hearing. .
A source emitting a 1000 Hz tone moves toward a stationary observer at 20 m/s. If the speed of sound is 340 m/s, what frequency does the observer detect?
1063 Hz
1125 Hz
937 Hz
1000 Hz
Using the Doppler formula for a moving source: f' = f × (v / (v - v?)). Substituting f=1000 Hz, v=340 m/s, v?=20 m/s gives 1000 × (340/320) ? 1062.5 Hz, rounded to 1063 Hz. This effect shifts frequency when the source moves relative to the observer. .
In a dispersive medium, which velocity describes the speed at which a pulse or wave packet travels?
Signal velocity
Group velocity
Particle velocity
Phase velocity
The group velocity is the speed at which the overall shape of a wave packet or pulse propagates through a medium. In dispersive media, phase velocity (speed of individual wave crests) differs from group velocity. Communication signals travel at the group velocity. .
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Study Outcomes

  1. Understand fundamental sound wave properties -

    Grasp the core concepts of amplitude, wavelength, frequency, and wave speed as they apply to sound waves.

  2. Calculate wave parameters -

    Use standard wave equations to determine frequency, period, wavelength, and speed in physics wave questions.

  3. Apply wave equations to real problems -

    Employ the relationship v = fλ and energy formulas to solve scenarios presented in the sound wave quiz.

  4. Analyze amplitude and energy relationships -

    Interpret how variations in amplitude influence wave energy and acoustic intensity.

  5. Differentiate mechanical wave types -

    Distinguish between longitudinal sound waves and transverse waves across different media.

  6. Interpret acoustic phenomena -

    Evaluate real-world acoustics quiz challenges, including resonance, interference, and standing waves.

Cheat Sheet

  1. Amplitude vs. Intensity -

    Amplitude is the maximum displacement of a wave, while intensity is the power transferred per unit area and scales as the square of the amplitude (I ∝ A²). For example, doubling the amplitude quadruples the intensity, a fact often tested in amplitude wavelength questions on your waves unit test. Review HyperPhysics (Georgia State University) for clear diagrams and derivations of this core concept.

  2. Wave Speed Relationship (v = f·λ) -

    The fundamental equation v = f·λ links wave speed (v), frequency (f), and wavelength (λ), and is a staple of any wave physics quiz or sound wave quiz. Remember that in air at 20 °C, v ≈ 343 m/s, so a 686 Hz tone has λ ≈ 0.5 m - perfect practice for physics wave questions. A handy mnemonic is "Very Fast Frogs Leap" to recall v = fλ instantly.

  3. Wave Equation Formulation -

    The one-dimensional wave equation ∂²y/∂x² = (1/v²)·∂²y/∂t² describes how disturbances propagate and is often featured on acoustics quiz sections. Understanding how to derive it from Newton's laws and Hooke's law (as shown in MIT OpenCourseWare) solidifies your grasp on wave mechanics. Practice by plugging in sinusoidal solutions y(x,t)=A sin(kx - ωt) and verifying both sides match.

  4. Longitudinal vs. Transverse Waves -

    Sound waves in fluids are longitudinal, featuring alternating compression (pressure antinodes) and rarefaction (nodes), while many mechanical waves on strings are transverse. Recognizing this distinction is key for your sound wave quiz and helps when drawing pressure vs. displacement graphs (source: Feynman Lectures on Physics). Try sketching both wave types side by side to reinforce their unique particle motions.

  5. Decibel Scale & Sound Pressure Level -

    The decibel (dB) scale quantifies sound pressure level as SPL = 20 log₝₀(P/P₀), where P₀ = 20 µPa is the reference threshold of hearing. Knowing that normal conversation (~60 dB) is 10❶ times more intense than the reference level will boost your confidence on acoustics quiz problems. For detailed tables of common SPLs, consult resources from the American Institute of Physics.

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