List THREE practical applications of the pitch of sound in technology. Is sound a longitudinal wave or a transverse wave? Draw a diagram showing the propagation of sound in air.

Here is the completed results table and the answers to your questions:

RESULTS:

AMPLITUDE	PATTERNS OBSERVED ON THE SCREEN (2)	LOUDNESS (Low, Louder, Loudest) (1)	Marks
1 V	Sine wave, small vertical displacement.	Low	3
2 V	Sine wave, medium vertical displacement.	Louder	3
3 V	Sine wave, large vertical displacement.	Loudest	3
4 V	Sine wave, very large vertical displacement.	Loudest	3

CONCLUSION:

1.1 Pitch
The amplitude of a sound wave, as observed on the oscilloscope, does not affect its pitch. Pitch is determined by the frequency of the wave.

1.2 Loudness
The amplitude of a sound wave, as observed on the oscilloscope (vertical displacement), is directly proportional to the loudness of the sound. A larger amplitude corresponds to a louder sound.

QUESTIONS:

1.3 List THREE practical applications of the pitch of sound in technology.

• Musical instruments: Tuning and playing instruments to produce specific notes (pitches).
• Medical imaging (ultrasound): Using high-frequency (high pitch) sound waves to create images of internal body structures.
• Sonar: Using sound waves of specific pitches to detect objects underwater.

1.4 Is sound a longitudinal wave or a transverse wave?
Sound is a longitudinal wave.

1.5 Draw a diagram showing the propagation of sound in air.
A diagram showing the propagation of sound in air should illustrate:

• Regions of compression where air particles are close together.
• Regions of rarefaction where air particles are spread apart.
• The particles oscillating parallel to the direction of wave propagation.