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SACE (South Australia) Sound — practice questions

Explore 31 free Sound questions in SACE (South Australia) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Sound questions and exercises with answers

Showing questions 1–30 of 31.

CLASS9 · Physics · Sound — Spot the ErrorRead the answer and worked solution →Sound — true or false?Read the answer and worked solution →Order how sound reaches your brainRead the answer and worked solution →Spot the odd sound frequencyRead the answer and worked solution →Based on the tabulated speed-of-sound data for various media, what is the speed of sound in fresh water at 20 degrees Celsius?Read the answer and worked solution →A sound wave has a frequency of 2000 Hz and a wavelength of 0.4 m. What is its speed?Read the answer and worked solution →A bat produces a sound with a frequency of 17,250 Hz and a wavelength of 0.019 m. What is the speed of this sound?Read the answer and worked solution →Dogs can hear frequencies up to 45 kHz. What is the wavelength of a 45,000 Hz sound wave traveling through air at 0 degrees Celsius?Read the answer and worked solution →A tuning fork oscillates at 512 Hz, and sound travels at 345 m/s. How many wave peaks reach the eardrum of a person sitting near the fork in 2 seconds?Read the answer and worked solution →How is the intensity of a sound wave defined?Read the answer and worked solution →A wave carries 10 W of power through an area of 5 square meters. What is the intensity of the wave?Read the answer and worked solution →An 87.0 dB sound has an intensity five times as great as an 80 dB sound. What difference in sound intensity level does a factor of 5 in intensity correspond to?Read the answer and worked solution →What sound intensity level, in decibels, corresponds to the reference intensity I0 = 10^-12 W/m^2, the threshold of human hearing?Read the answer and worked solution →Observing which phenomenon in a disturbance can be taken as support that the disturbance is a wave?Read the answer and worked solution →Two waves with frequencies f1 and f2 are superimposed. What formula gives the beat frequency f_B?Read the answer and worked solution →Two sound waves have frequencies of 250 Hz and 280 Hz. What beat frequency do they produce when superimposed?Read the answer and worked solution →A piano tuner compares a piano string with a 256 Hz tuning fork and hears 2 beats per second. What are the possible frequencies of the piano string?Read the answer and worked solution →A closed-pipe resonator has a length of 0.672 m, and the speed of sound is 344 m/s. What is its fundamental frequency?Read the answer and worked solution →An open-pipe resonator has a fundamental frequency of 120 Hz. What is the frequency of its third overtone?Read the answer and worked solution →Faster or slower sound?Read the answer and worked solution →Pitch up or pitch down?Read the answer and worked solution →Sound words bingoRead the answer and worked solution →Catch what sound needsRead the answer and worked solution →Spot the odd oneRead the answer and worked solution →Match the sound wordsRead the answer and worked solution →Loud or feebleRead the answer and worked solution →Can humans hear itRead the answer and worked solution →Frequency figuresRead the answer and worked solution →Sound facts, true or falseRead the answer and worked solution →The sound sentenceRead the answer and worked solution →

Worked practice questions

CLASS9 · Physics · Sound — Spot the Error

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Questions
  1. Statement parts
    1. Sound
    2. travels
    3. fastest
    4. through
    5. gases
    6. .
    Correction
    solids
    Incorrect part
    gases
  2. Statement parts
    1. Pitch
    2. of
    3. a
    4. sound
    5. depends
    6. on
    7. its
    8. amplitude
    9. .
    Correction
    frequency
    Incorrect part
    amplitude
  3. Statement parts
    1. The
    2. human
    3. ear
    4. can
    5. hear
    6. frequencies
    7. above
    8. 20
    9. kHz
    10. .
    Correction
    between 20 Hz and 20 kHz
    Incorrect part
    above
  4. Statement parts
    1. An
    2. echo
    3. is
    4. heard
    5. when
    6. sound
    7. is
    8. absorbed
    9. by
    10. a
    11. surface
    12. .
    Correction
    reflected
    Incorrect part
    absorbed
Instructions
Tap the wrong word in each statement.

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Sound — true or false?

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Questions
  1. Statement is true
    Yes
    Statement
    Sound is a longitudinal wave.
  2. Statement is true
    No
    Statement
    Sound can travel through vacuum.
  3. Statement is true
    Yes
    Statement
    Speed of sound in air is approximately 343 m/s at room temperature.
  4. Statement is true
    Yes
    Statement
    Frequency of audible sound is roughly 20 Hz to 20 kHz.

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Order how sound reaches your brain

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Steps
  1. A vibrating object creates a disturbance in the air
  2. The disturbance travels as a longitudinal wave
  3. The wave reaches your ear and vibrates the eardrum
  4. Tiny bones amplify the vibration to the inner ear
  5. Nerve signals reach the brain, which interprets sound
Instructions
Tap the stages in order, from a vibrating object to the sound your brain finally hears.

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