The diagram shows how a wave can be represented on an oscilloscope screen. Complete the diagram using the words from the list. [wavelength, frequency, amplitude, period]

Sound waves are longitudinal waves. The region of the high density of particles in the medium during propagation of sound is called compression and low-density regions are called rarefaction. The maximum disturbance of particles in the medium on either side of the mean position is called the amplitude of the wave. Amplitude is measured in metres ( m ) . The distance between two consecutive compressions or two consecutive rarefactions is called the wavelength of a sound wave. Being a length, the wavelength is measured in metres. SI unit of wavelength is metre ( m ) .

E M B I B E

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 1

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Earn 100

Look at the diagram of a human ear. Complete the diagram by writing in the labels. Use words from the list below. The first label has been completed for you.

[ear canal, eardrum, ossicles, nerve]

Important Questions on Sound

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 2

Explain how sounds can damage our ears.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 3

Choose which of these activities should only be carried out if we wear ear protection.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 4

Choose the correct estimate of the speed of sound in air.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 5

Describe what happens when we hear an echo.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 8

Engineers testing steel rails can use a microphone to record the sounds of an approaching train. The microphone records the sound of an approaching train for many seconds before the engineers can hear it themselves. The results are shown on an oscilloscope screen. Use your knowledge of the speed of sound to explain what the engineers observe.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 9

Bats use sound to steer around obstacles in the dark. The bats produce sounds to bounce off objects. The diagram shows the face of a horseshoe bat.

Question Image
Suggest why this bat’s face is shaped this way.