Which of these statements comparing sound waves and light waves is not correct?

• A Sound waves are longitudinal waves, whereas light waves are transverse waves.
• B Sound waves can travel through a vacuum, whereas light waves require a material medium to propagate.
• C Both sound waves and light waves transfer energy without transferring matter.
• D Both sound waves and light waves can be reflected and refracted.

A student uses a microphone and an oscilloscope to display a sound wave. The diagram shows the trace on the oscilloscope screen.

Draw on this

Calculate the frequency of this sound wave.

Describe how the amplitude and the wavelength of the trace on the screen would change if the student played a quieter sound wave of a higher pitch.