CRASHCOURSE QUIZ BLOCK 3

Waves transfer ______ without transferring matter.

• energy

• mass

• light

• sound

Wave motion can be illustrated by vibrations in ______ and springs, and by experiments using water waves.

• ropes

• pipes

• wires

• tubes

Describe the features of a wave in terms of wavefront, wavelength, frequency, crest (peak), trough, amplitude and wave speed.

• Wavefront: the line joining points in phase; Wavelength: distance between two consecutive crests or troughs; Frequency: number of waves passing a point per second; Crest: highest point; Trough: lowest point; Amplitude: maximum displacement; Wave speed: distance travelled by a wave per unit time.

• Wavefront: the highest point of a wave; Wavelength: time taken for one oscillation; Frequency: distance between two crests; Crest: lowest point; Trough: highest point; Amplitude: number of waves per second; Wave speed: maximum displacement from rest.

• Wavefront: the lowest point of a wave; Wavelength: number of waves per second; Frequency: distance between two troughs; Crest: maximum displacement; Trough: minimum displacement; Amplitude: time taken for one oscillation; Wave speed: distance between two crests.

• Wavefront: the distance between two crests; Wavelength: the line joining points in phase; Frequency: maximum displacement; Crest: number of waves per second; Trough: distance travelled per unit time; Amplitude: lowest point; Wave speed: highest point.

Recall and use the equation for wave speed: v = fλ. What does 'v' represent in this equation?

• Wave speed

• Frequency

• Wavelength

• Amplitude

For a transverse wave, the direction of vibration is at ______ angles to the direction of propagation.

• right

• acute

• obtuse

• straight

For a longitudinal wave, the direction of vibration is ______ to the direction of propagation.

• parallel

• perpendicular

• random

• opposite

Waves can undergo: (a) reflection at a plane surface, (b) refraction due to a change of speed, (c) diffraction through a narrow gap. Which of these involves a change in direction due to a change in speed?

• reflection at a plane surface

• refraction due to a change of speed

• diffraction through a narrow gap

A ripple tank can be used to show: Which phenomenon is demonstrated when waves bend around a barrier?

• reflection at a plane surface

• refraction due to a change in speed caused by a change in depth

• diffraction due to a gap

• diffraction due to an edge

How does wavelength and gap size affect diffraction through a gap?

• Diffraction is most significant when the wavelength is comparable to the gap size; larger wavelengths or smaller gaps increase diffraction.

• Diffraction is most significant when the gap size is much larger than the wavelength; smaller wavelengths increase diffraction.

• Diffraction is unaffected by the relationship between wavelength and gap size.

• Diffraction decreases as the wavelength becomes comparable to the gap size.

How does wavelength affect diffraction at an edge?

• Longer wavelengths result in greater diffraction at an edge.

• Shorter wavelengths result in greater diffraction at an edge.

• Wavelength has no effect on diffraction at an edge.

• Diffraction at an edge only occurs for visible light.