Waves Chapter 8

When a sound from a musical instrument is described as becoming 'louder in volume and lower in pitch', this must mean that

• the amplitude of the pressure variations has increased and the frequency has also increased.

• the amplitude of the pressure variations has decreased and the frequency as also decreased.

• the amplitude of the pressure variations has decreased and the frequency has increased.

• the amplitude of the pressure variations has increased and the frequency has decreased.

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• remains the same because the speed is fixed.

• halves because the speed is fixed.

• changes depending on the change in wave speed.

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A drummer beats his drum five times every two seconds. What is the frequency of the drumming? Make sure you include units.

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A speaker is set up in a classroom. It is shown that the speaker emits a sound which is measured to be 70 Hz with a wavelength of 5 m. What is the speed of this
sound in air?

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A water wave propagates through a tank of 1.2 m. Each wavelength is 5 cm. How many peaks will there be in total?

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The period of the water wave is 0.01 s. How long will it take the wave to transfer energy from one side of the 1.2 m tank to the other if there are 24 peaks and 24 troughs?

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Determine the period of the wave responsible for the motion of the particle depicted on the graph below.

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Calculate the speed of the wave if the wave moves 2 m in the time for one period.

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Your friend wants to install a small mirror on the wall in their house. You are told that when they are standing their eyes are 1.5 m directly above their toes. Use the law of reflection to determine how far the bottom of the mirror has to be off the ground so your friend can see their shoes in the mirror.