1. Waves Wave speed = Frequency x Wavelength Metres/second m/s Hertz Hz Metres m What is the wave speed when the frequency of a wave is 2.5Hz and the wavelength is 4m? What is the wave speed when the frequency of a wave is 5Hz and the wavelength is 10m? What is the wave speed when the frequency of a wave is 12Hz and the wavelength is 2m? 10 m/s 50 m/s 24 m/s

2. This is a diagram of a wave. Match A,B,C,D with numbers 1,2,3,4 in the table. 3 2 1 4

3. Many everyday devices use electromagnetic waves… Match the electro magnetic waves (A,B,C,D) with the devices (1,2,3,4) AInfra RedCRadio Waves BMicrowavesDVisible Light 2 3 4 1

4. This diagram shows an atom… Match parts of the atom (A,B,C,D) with the labels (1,2,3,4) on the atom. AElectronCNucleus BNeutronD Proton 2 4 1 3

5. The graph shows the count rate from a gamma radiation after it has passed through different thickness of concrete. A = 8 B= 12 C = 30 D = 60 The count rate when there is no concrete = ___1___ counts per second. The thickness of the concrete when the count rate is 10 counts per second __2__ cm. The thickness of the concrete needed to reduce the count rate by half = __3__ cm. The reduction in count rate when the thickness of concrete is measured from 30 to 60 cm = __4__ counts per second. A D C B

6. Electromagnetic Waves can be grouped into types. Each type has a different range of wavelengths. Match the types of radiation (A,B,C,D) with numbers (1-4) in the table. A = Microwaves B = X-Rays C = Visible Light D = Radio Waves 3 1 2 4