Chapter 13 - Waves - Calvin Kong Physics Tuition

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1.

A transverse wave can be demonstrated using a rope. Describe how the hand must move to make a transverse wave of frequency 5 Hz.

• For a transverse wave to move from left to right, the hand must move in a to and fro motion vertically.

• There should be 5 oscillations of the hand in 1 second.

2.

A wave travels in a medium with a certain speed. What must be done to double the wavelength of the wave in the same medium?

• Since the wave is in the same medium, the speed does not change.

• From speed of wave = frequency x wavelength, the source of the wave should be at half the frequency in order to achieve a doubled wavelength.

3.

Describe what happens to water waves as it travel from a deep to shallow region.

• When water wave travels from a deep to shallow region, its speed is slowed down while its frequency remains constant.

• Since speed of wave = frequency x wavelength, the wavelength will decrease too.

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