Wave Basics

Which one of the following does not apply to sound waves?

• They transmit energy.

• They travel faster in a vacuum.

• They result from vibrations.

• They are longitudinal waves.

The speed of sound in steel is 6000ms^–1. The wavelength of an ultrasound wave of frequency 50 kHz travelling through a steel girder is...

• 0.0083 m

• 0.12 m

• 8.3 m

• 120 m

The critical angle for glass is c.

Which one of the following statements is true for light at the straight edge?

• When i is bigger than c then no light is reflected.

• When i is bigger than c then no light is transmitted.

• When i is smaller than c then no light is reflected.

• When i is smaller than c then no light is transmitted.

Which of the following electromagnetic radiations has the highest frequency?

• Infrared

• Radio

• Ultraviolet

• X-rays

Which of the following properties could not be demonstrated using sound waves?

• Diffraction

• Polarisation

• Reflection

• Refraction

An earthquake wave travels in an east-west direction in rocks.

The rocks are vibrating in a north-south direction.

The wave must be classified as a...

• Longitudinal wave

• Standing wave

• Stationary wave

• Transverse wave

The refractive index of glass can be found by tracing a ray of light through a block of glass and measuring angles.

Which of the following expressions is equal to the refractive index of glass?

• Sin w / Sin y

• Sin y / Sin w

• Sin x / Sin z

• Sin z / Sin x

Identify which of the following pairs of units are both SI base units.

• Ampere Hertz

• Ampere Second

• Coulomb Hertz

• Coulomb Second

A cathode ray oscilloscope can be used to show how the displacement of a wave varies with time. Each square in the horizontal direction represents 5.00 ms.

The frequency of the wave is...

• 25 Hz

• 50 Hz

• 250 Hz

• 500 Hz

What happens to the speed of the light as it enters the glass block?

• Increases

• Decreases

• No Change