(a(i))[1]
State which type of electromagnetic wave is used for the mobile phone signal.
(a(ii))[1]
State one type of electromagnetic wave that has a shorter wavelength than visible light.
(b(i))[2]
State the audible frequency range for a healthy human ear, and include the unit.
(b(ii))[2]
Note B appears on the same oscilloscope screen as note A. Describe the differences between the wave for note B and the wave for note A. You may draw on Fig. 8.2 to show the differences.