Review unit 6+7

What is a unit of wavelength?

• hertz

• metre

• metre per second

• second

• A

• B

• C

• D

Which diagram shows how a converging lens is used as a magnifying glass?

• 
• 
• 
• 

• A

• B

• C

• D

• A

• B

• C

• D

A person uses a surfboard to ride every 30th wave crest towards the beach. The wave crest travels at a speed of 1.6 m/s and the distance between each wave crest is 24m.

How many wave crests does the person surf in one hour?

• 1

• 2

• 8

• 450

• A

• B

• C

• D

Light passes along an optical fibre.

What happens to the light within the fibre?

• diffraction

• dispersion

• refraction

• total internal reflection

The points labelled F are the principal foci of a lens. A beam of parallel light is incident on the lens.

Which diagrams shows the path of the light after it passes through the lens?

• 
• 
• 
• 

Which statement about sound waves is correct?

• They are able to travel through a vacuum.

• They are able to travel through solids.

• They are transverse waves.

• They travel at the same speed in all substances.