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]
State one difference and one similarity between the oscillations of a stationary sound wave and a progressive sound wave.
Difference: ..........................................................................................................
Similarity: ..........................................................................................................
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.
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.
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