Fig. 7.1 illustrates several applications of electromagnetic radiation together with different parts of the electromagnetic spectrum. The applications shown are: Bluetooth headset, thermal imaging, photography of people's faces, sterilising medical equipment. The parts shown are: gamma rays, radio waves, infrared, visible light. One linking line has already been drawn.
(a)[2]
For each application, draw a line to the appropriate region of the spectrum. Use each region of the spectrum once only.
(b)[1]
State the speed of electromagnetic waves in a vacuum.
(c(i))[3]
Calculate the wavelength of the radio waves at the midpoint of the frequency range.
(c(ii))[1]
Suggest why a Bluetooth headset only works well over short distances.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Bluetooth headset is linked to radio waves” …