This question is about waves.
Fig. 16.1
Show that the speed v of the wave is given by the equation v = f.
[2]
A sample of the transparent material is placed in a vacuum.
Fig. 16.2 shows the path of two identical rays of light L and M from a laser.
Fig. 16.2
The refractive index of the material is 1.20. The thickness of the material is 1.5 × 10–6 m.
The wavelength of the light in vacuum is 6.0 × 10–7 m.
t = ....................................... s [3]
T = ...................................... s [2]
φ = ........................................ ° [1]
The speed v is about 1ms–1 for a depth of about 10cm.
You are provided with a rectangular plastic tray, supply of water and other equipment available in the laboratory.
Describe how an experiment can be conducted in the laboratory to test the validity of the equation above and how the data can be analysed to determine a value for g.
[6]
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