Sound: speed, pitch and loudness
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
One cricket chirps at 30 dB where Ari stands. 100 identical crickets chirp together at the same spot. What level is measured, to the nearest dB?
One cricket chirps at 20 dB where Esme stands. 10000 identical crickets chirp together at the same spot. What level is measured, to the nearest dB?
What is the frequency of trace P, Jun?
- 5,000 Hz
- 500 Hz
- 5 Hz
- 50 Hz
How does trace Q compare with trace P, Kira?
Use the picture in question 3.
- A higher pitch, with 4 times the intensity
- The same pitch, with twice the intensity
- The same pitch, with 4 times the intensity
- The same pitch, with 10 dB more than P
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Speed of sound (Engineering ToolBox)
Material Speed (m/s) air at 20 °C 343.3 fresh water at 20 °C 1481 steel (1% carbon) 5940 How long does sound take to cross 1,481 m of lake water, Milo?
- 0.23 s
- 4.3 s
- 1.0 s
A 440 Hz tone passes from air into fresh water. What is its wavelength in the water, Noah?
- About 0.78 m
- About 0.18 m
- About 3.4 m
The same 440 Hz tone passes from air into fresh water. What is its frequency in the water, Pia?
- 440 Hz, the same as in air
- About 102 Hz, since sound is 4.3 times faster
- About 1,900 Hz, since sound is 4.3 times faster
NIOSH: 85 dBA is safe for 8 hours, and each 3 dB more halves the safe time. How long is 94 dBA safe for, Ren?
- 30 minutes
- 1 hour
- 2 hours
- 4 hours
NIOSH: 85 dBA is safe for 8 hours, and each 3 dB more halves the safe time. How long is 100 dBA safe for, Tala?
- 30 minutes
- 7.5 minutes
- 15 minutes
- 1 hour
NIOSH: 85 dBA is safe for 8 hours, and each 3 dB more halves the safe time. Zee listens for 30 minutes. What is the loudest safe level?
- 94 dBA
- 97 dBA
- 100 dBA
- 91 dBA