4.2 Travelling Waves

A radio station broadcasts in the frequency range 97-99 MHz.

What range of wavelengths are being used?

A longitudinal travelling wave has speed v and wavelength λ. What is the least distance between a compression and a rarefaction measured against the direction of propagation?

A sound wave has a wavelength of 0.40 m. What is the phase difference between two points along the wave which are 1.7 m apart?

Two waves are travelling from the surface of the Sun to the upper atmosphere of Earth.

Which statements must be correct?

1. The waves have the same frequency
2. The waves have the same speed
3. Neither wave is longitudinal
4. At least one of the waves is audible to humans

A section of the electromagnetic spectrum is shown. What could the labelled sections represent?

Which is a possible frequency of visible light?

Sound waves can be propagated through fluids and solids. Which statements are correct?

1. Sound waves have constant speed in air
2. Thunder always arrives before lighting because of the difference in wave speeds.
3. Sound waves can be modelled using the equation that v = fλ
4. Vibrations from an earthquake will be felt in the ground before they are heard, because of the difference in wave speeds

Which cannot be observed with ultrasound?

Approximately how many times larger is the wavelength of sound waves which are audible to humans greater than the wavelength of light waves which are visible to humans?