1a5 marks
a)
The normal frequency range of hearing for young people is from 20 Hz to 20 kHz.
i)
The speed of sound in air is 340 m s–1.
Calculate the shortest wavelength a young person can hear.
wavelength = ..................................................... m [2]
ii)
Describe how you can use an oscilloscope, and other additional laboratory equipment, to determine the actual upper limit of the frequency range for a young person.
[3]
1b2 marks
b)
State one difference and one similarity between the oscillations of a stationary sound wave and a progressive sound wave.
Difference: .................................................................................................................
Similarity: ...................................................................................................................
[2]
1c3 marks
c)
You are provided with a ray-box, a semi-circular block of plastic and other normal laboratory equipment.
The outline of the block is shown below.
The outline of the block is shown below.
Describe how you could measure the refractive index n of the block using the critical angle method. Draw on the diagram and label it to make your answer clear.
[3]
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