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  1. Problems
  2. /Waves & Sound

Waves & Sound

Physics

Wave motion, interference, and acoustics.

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39 problems
Type:
1.
Doctors use ultrasound to look at a baby before birth.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
2.
One ultrasound pulse from a ship gives two echoes.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Hard
3.
A ship's SONAR gets an echo from a shoal of fish 0.32 s after the pulse is sent.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
4.
A ship sends a pulse of ultrasound down.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
5.
A dog whistle gives a sound of frequency 28 000 Hz.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
6.
Say if each sound is infrasound, audible or ultrasound for a person: 8 Hz, 640 Hz, 19 000 Hz, 42…
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
7.
Put these parts in the order in which a sound passes through them: the cochlea, the eardrum, the…
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
8.
A big hall has a very long reverberation, and the words of a speaker are hard to understand.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
9.
A girl claps 14 m from a wall. Will she hear a separate echo?
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
10.
A boy claps in front of a wall and hears the echo 0.35 s later.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
11.
A girl shouts in front of a cliff and hears the echo 2.5 s later.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
12.
A student claims that a loud sound travels faster than a soft one, because it has more energy.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Hard
13.
Two friends speak to you on the telephone, with the same pitch and the same loudness.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
14.
For each change, say if it changes the loudness or the pitch of the sound.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Easy
15.
A child hears frequencies from 20 Hz to 20 000 Hz; an older person only up to 12 000 Hz.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Medium
16.
A sound of frequency 850 Hz travels in air at 340 m/s.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Medium
17.
A sound in a pipe filled with helium has a frequency of 1600 Hz and a wavelength of 0.6 m.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Easy
18.
A tuning fork of frequency 320 Hz makes a sound in air.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Easy
19.
A graph of pressure against time shows 6 complete waves in 0.018 s.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Medium
20.
The time period of a vibrating string is 0.0032 s. What is its frequency?
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Easy
21.
A source makes 75 vibrations in 3 s. Find its frequency and its time period.
High School (9–10), General · Wave Motion, Sound Waves and HearingStemPy LabStemPy Lab
Easy
22.
A sound travels 2040 m in water, where its speed is 1500 m/s.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Hard
23.
Sound travels at 343 m/s in air, 1498 m/s in water and 5950 m/s in iron.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
24.
The temperature of the air is 40 °C. Use v = (331 + 0.6T) m/s, with T in °C, to find the speed of…
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
25.
A worker knocks on one end of a long steel rail.
High School (9–10), General · Sound Waves and HearingStemPy LabStemPy Lab
Medium
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