(a(i))[1]
State what the term ‘frequency’ means.
(a(ii))[2]
Calculate the speed of ultrasound in air, showing your working.
(a(iii))[1]
State one practical use of ultrasound.
(b(i))[3]
Sound waves are longitudinal waves. Water waves are transverse waves. Describe, using the motion of particles in the wave, how a longitudinal wave differs from a transverse wave. You may add a labelled diagram to support your description.
(b(ii))[1]
State one source of waves that produces both longitudinal and transverse waves.
(c)[2]
Fig. 4.1 shows radio waves with long and short wavelengths travelling over the same hill. Explain why the radio waves in diagram A reach the house whereas the radio waves in diagram B do not reach the house.