Sound production and transmission — KCSE Physics

KCSE Physics · 112 practice questions · 9 syllabus objectives

36 easy38 medium38 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe resonance in air columns and calculate frequency from successive resonance lengths

Explain that sound is a longitudinal mechanical wave that requires a medium for transmission

State that sound travels at approximately 340 m/s in air and apply v = d/t to calculate distance using echoes

Describe how sound is produced and transmitted in musical instruments (strings, pipes, drums)

State that sound is produced by vibrating bodies and requires a material medium for transmission

Explain why the speed of sound is greatest in solids, less in liquids and least in gases

State factors affecting speed of sound in air including temperature, humidity and wind

Define echo and solve problems involving echoes, depth sounding and speed of sound calculations

Sound production and transmission

Sample Questions

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easySHORT ANSWER2 marks

Explain why sound travels faster in solids than in gases, providing two reasons. (2 marks)

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Part (a) — 2 marks

Particles in solids are closely packed, allowing quicker transfer of vibrations (1 mk)

Solids have higher density and elasticity, facilitating faster wave propagation (1 mk)

easySHORT ANSWER4 marks

Identify two properties of sound and explain how each is related to vibrating bodies and the medium required for transmission. (4 marks)

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Part (a) — 2 marks

Frequency (1 mk)

Amplitude (1 mk)

Part (b) — 2 marks

Frequency is determined by the rate of vibration of the source, indicating how fast the body vibrates (1 mk)

Amplitude relates to the energy of the vibrations, showing how much the particles of the medium are displaced during sound transmission (1 mk)

easySHORT ANSWER4 marks

List three ways in which sound is produced in stringed instruments, and explain how each method contributes to sound production. (4 marks)

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Part (a) — 3 marks

Plucking the string causes it to vibrate (1 mk)

Bow friction on the string produces vibrations (1 mk)

Striking the string with a mallet creates vibrations (1 mk)

Part (b) — 1 mark

Vibrating strings create sound waves in the air (1 mk)

A person claps their hands and hears the echo 2 seconds later. Calculate the distance to the wall if sound travels at 340 m/s in air. (3 marks)

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Sound production and transmission — KCSE Physics

What You'll Learn

Sample Questions

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Why Practise Sound production and transmission?

KNEC Aligned

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