Waves, Sounds, and Light

Which row correctly describes light waves?

• A

• B

• C

• D

The diagram shows part of a diffracted wave pattern. Changes are made to the wavelength and to the gap size to produce a semicircular diffracted wave pattern.

Which row produces the required semicircular diffracted wave pattern?

• gap in barrier: larger; wavelength: same

• gap in barrier: larger; wavelength: smaller

• gap in barrier: same; wavelength: larger

• gap in barrier: same; wavelength: smaller

The diagram shows white light passing through a prism. Which description of what happens as the light passes into the prism is correct?

• The speed of the red light is less than the speed of the violet light and the red light is the least refracted.

• The speed of the red light is greater than the speed of the violet light and the red light is the least refracted.

• The speed of the violet light is less than the speed of the red light and the violet light is the least refracted.

• The speed of the violet light is greater than the speed of the red light and the violet light is the least refracted.

Which row gives possible values for the speed of sound?

• A

• B

• C

• D

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies.

Which row describes the amplitude and the frequency of the sound?

• A

• B

• C

• D

Which term is the number of crests of a wave passing a point per second?

• amplitude

• frequency

• speed

• wavelength

White light is dispersed by a prism. Compared with blue light, the red light is

• slowed down less and refracted less.

• slowed down less and refracted more.

• slowed down more and refracted less.

• slowed down more and refracted more.

What is the approximate value for

• 10²

• 10⁴

• 10⁶

• 10⁸

What are the lowest frequency and the highest frequency of the sound that a human being with

normal hearing can hear?

• A

• B

• C

• D

Ultrasound has a number of uses in engineering and medicine. What is ultrasound not used for?

• cleaning

• pre-natal scanning

• quality control

• sterilizing medical equipment