Electromagnetic Spectrum – Practice Exam Questions
1.	The boxes on the left show some types of electromagnetic radiation. The boxes on the right show some uses of electromagnetic radiation.  Draw a straight line from each type of radiation to its use.
The first one has been done for you.								(3)

2.	A radio navigation beacon transmits at 1.5 MHz.  Calculate the wavelength of the radio waves.  
(The speed of radio waves is 3 × 108 m/s.)								(2)
3.	(a) Light is a type of electromagnetic radiation Write down one type of electromagnetic radiation with a wavelength:
(i)	longer than that of light 										(1)
(ii)	shorter than that of light 										(1)

4.	The diagram shows the electromagnetic spectrum.

Gamma rays	X-rays	Ultra violet	Visible light	Infra red	Microwaves	Radio	
(a)	Name the type of electromagnetic radiation which is used:
(i)	to prevent fresh food going bad quickly.								(1)
(ii)	to heat passengers’ meals in an aeroplane.								(1)
(b)	(i)  State one use of X-rays.										(1)
	(ii) State one use of ultra violet radiation. 								(1)
 (c)	Longer wavelength radio waves are used for communications over very long distances without using satellites. Explain why this is possible.								(3)