Wave Theory - 2

Water waves travel from deeper water to move to more shallow water. This causes them to refract. Which wave property always remains the same when refraction occurs?

• Wavelength

• Frequency

• Amplitude

• Speed

Which of the following waves are longitudinal?

• Radio waves from a radio broadcaster.

• Infrared waves from an oven.

• Sound waves from a guitar

• Water waves on a lake

The following table shows some examples of waves. Which row correctly lists the nature of each of the wave types?

• A

• B

• C

• D

What is the definition of the word amplitude?

• The number of complete waves that pass a point per second.

• The distance from the peak of one wave to the peak of an adjacent wave.

• The distance from the equilibrium position of a peak plus the same distance from a trough.

• The maximum distance from the equilibrium position of any point on a wave.

What is the name given to the effect that allows the wavefronts to reach point X, shown on the diagram?

• Reflection

• Refraction

• Diffraction

• Dispersion

Sound waves travel at a speed of 1500 m/s through a substance. Their wavelength is 5.00 cm. What is their frequency?

• 30 kHz

• 75 Hz

• 7.5 Hz

• 300 Hz

The diagrams below show the wavefront diagrams of light as it passes from glass into air. They are magnified many times.

Which diagram correctly shows what happens to the wavefronts as they pass the glass-air boundary?

• A

• B

• C

• D

Which of the following statements about sound waves is incorrect?

• Sound waves are longitudinal.

• Sound waves transfer energy away from the source.

• Sound waves push air away from the source.

• Sound waves cause objects to vibrate.

The speed of a wave is doubled. The frequency remains the same.

What happens to the wavelength of the wave?

• It doubles

• It halves

• It remains the same

• It becomes four times as large

Which two points on the wave are exactly one wavelength apart?

• P and S

• Q and R

• Q and S

• P and S