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Grade 9 Sound

This worksheet focuses on sound physics concepts for Grade 9, including calculations for wavelength, depth measurement using sound pulses, and effects of amplitude and frequency on sound characteristics. It contains practical problems related to sound waves in different mediums and their properties. Additionally, it includes multiple-choice questions to assess understanding.

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ahaan.somjee
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17 views3 pages

Grade 9 Sound

This worksheet focuses on sound physics concepts for Grade 9, including calculations for wavelength, depth measurement using sound pulses, and effects of amplitude and frequency on sound characteristics. It contains practical problems related to sound waves in different mediums and their properties. Additionally, it includes multiple-choice questions to assess understanding.

Uploaded by

ahaan.somjee
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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GRADE 9 - PHYSICS WORKSHEET -SOUND

1. A device at the bo om of the sea emits a sound wave of frequency 200Hz.


(i) The speed of sound in sea-water is 1500m/s. Calculate the wavelength of the sound in sea-water.

wavelength=................................................................. [2]
(ii) The sound wave passes from the sea-water into the air. State what happens, if anything, to
•the frequency of the sound
..........................................................................................................................................
• the speed of the sound ................................................................................................................................ [2]
2. A ship uses pulses of sound to measure the depth of the sea beneath the ship. A sound pulse is transmi ed into
the sea and the echo from the sea-bed is received a er 54 ms. The speed of sound in seawater is 1500 m / s.
Calculate the depth of the sea beneath the ship.

depth = ...........................................................[3]
3. State the effect on the loudness and pitch of the sound from the loudspeaker when
(i) the amplitude increases but the frequency of the sound stays the same,
loudness ............................................................................................................................
pitch ...................................................................................................................................
(ii) the amplitude stays the same but the frequency increases.
loudness ............................................................................................................................
pitch ................................................................................................................................... [2]
4. (a) Fig. 5.1 shows the air pressure varia on along a sound wave.

(i) On AB in Fig. 5.1, mark one point of compression with a dot and the le er C and the next point of rarefac on
with a dot and the le er R.
(ii) In terms of the wavelength, what is the distance along the wave between a compression and the next
rarefac on? ................................................................................................................................... [3]

(b) A sound wave travels through air at a speed of 340m/s. Calculate the frequency of a sound wave of
wavelength 1.3m.

frequency = ......................... [2]

1.
2.

3.

4.
SOUND MS

1.

2.

3.

4.

MCQ
1. B
2. C
3. A
4. D

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