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physics Physics For High Schools (KS4)

Solved problems for the chapter:

Loudness

View the theory »

Sound Waves

1. What is sound?

2. Progressive Longitudinal Wave

3. Speed of sound

4. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:loudness/3620/

Example 1.

A quiet sound is produced by a loudspeaker. The loudness of the sound is increased. Which property of the sound wave is increased?

Speed
frequency
amplitude
wavelength

Example 2.

In a test, a car horn is found to be too loud and the pitch of the note is too high. What information does this give about the amplitude and the frequency of the sound wave produced?

	amplitude	frequency
A	too large	too large
B	too large	too small
C	too small	too large
D	too small	too small

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies. Which line in the table describes the amplitude and the frequency of the sound?

	amplitude	frequency
A	constant	varying
B	constant	constant
C	varying	constant
D	varying	varying

A police car siren emits two different sounds P and Q. These are produced alternatively. The diagram below represents the sounds emitted.

Which sound is louder and which sound has the lower pitch?

	louder	lower pitch
A	P	P
B	P	Q
C	Q	P
D	Q	Q

Two sounds X and Y are produced by loudspeakers. The amplitude and frequency of each sound wave are given in the table below.

	amplitude /mm	frequency /Hz
X	1.3	475
Y	2.0	235

How does sound Y compare with sound X?

Y is louder and has a higher pitch.
Y is louder and has a lower pitch.
Y is quieter and has a higher pitch.
Y is quieter and has a lower pitch.

The diagrams show the wave shapes of two different sounds. The scales are the same in each diagram.

How does sound 2 compare with sound 1?

Sound 2 is louder than sound 1
Sound 2 is quieter than sound 1
Sound 2 has a higher pitch than sound 1
Sound 2 has a lower pitch than sound 1

The frequency of a musical note is increased. A student hearing the sound detects an increase in which property?

loudness of the sound
pitch of the sound
speed of the sound wave
wavelength of the sound wave

The diagram represents the waves produced by four sources of sound. The scales are the same for all the diagrams. Which sound has the highest frequency?

Sound wave P has a greater amplitude and a larger wavelength in air than sound wave Q. How do the loudness and pitch of P compare with the loudness and pitch of Q?

P is louder and higher in pitch than Q.
P is louder and lower in pitch than Q.
P is quieter and higher in pitch than Q
P is quieter and lower in pitch than Q.

10.

The diagrams represent two sound waves. The scales in the two diagrams are the same.

Which statement describes the waves?

The waves have different loudness and different pitch.
The waves have different loudness but the same pitch.
The waves have the same loudness and the same pitch.
The waves have the same loudness but different pitch.

11.

A sound wave has a certain amplitude and a certain frequency. A second sound wave is quieter and lower in pitch than the first sound wave. The second wave has:

a larger amplitude and a greater frequency.
a larger amplitude and a smaller frequency.
a smaller amplitude and a greater frequency.
a smaller amplitude and a smaller frequency.

12.

A police car sounds its siren when travelling to an emergency. The siren produces two different sounds P and Q, which are emitted alternately. The diagram below represents the sound waves emitted by the siren.

Which of the two sounds P and Q is the louder and which has the higher pitch?

	louder sound	sound of higher pitch
A	P	P
B	P	Q
C	Q	P
D	Q	Q

13.

A singer sings two notes. The first note is louder and lower in pitch than the second note. Which statement about the two notes is correct?

The first note has a larger amplitude and a larger frequency than the second note.
The first note has a larger amplitude and a smaller frequency than the second note.
The first note has a smaller amplitude and a larger frequency than the second note.
The first note has a smaller amplitude and a smaller frequency than the second note.

14.

The diagrams below show the wave patterns of four sounds shown on a cathode-ray oscilloscope (c.r.o.). The oscilloscope controls are set the same for each sound. Which sound has the highest pitch?

15.

A fire alarm is not loud enough and the pitch is too low. An engineer adjusts the alarm so that it produces a louder note of a higher pitch. What effect does this have on the amplitude and on the frequency of the sound waves that the alarm produces?

	amplitude	frequency
A	larger	larger
B	larger	smaller
C	smaller	larger
D	smaller	smaller

16.

The diagram below shows four waves drawn to the same scale.

Which statement is correct?

The amplitude of wave P is the same as the amplitude of wave R.
The amplitude of wave S is double the amplitude of wave Q.
The frequency of wave Q is double the frequency of wave P.
The frequency of wave S is the same as the frequency of wave Q.

17.

Which wave has an amplitude different from the rest?

18.

Which property of a sound wave affects the loudness of the sound?

amplitude
frequency
speed
wavelength

19.

Four sound waves W, X, Y and Z are displayed by an oscilloscope screen. The oscilloscope settings are the same in each case.

Which two sounds have the same pitch?

W and X
W and Y
X and Y
Y and Z

20.

The figures below show four traces produced by an oscilloscope for different sounds. For each trace, the same settings of the oscilloscope were used.

In the box, write the letter A, B, C, or D of the trace showing the sound with the highest pitch.
Complete the statement using the letters of the traces.

The two traces that have the same amplitude are ......... and ......... .