A healthy human ear can hear a range of frequencies.
Three frequency ranges are shown.
Draw a ring around the range for a healthy human ear.
0 Hz − 20 Hz 10 Hz − 10 000 Hz 20 Hz − 20 000 Hz
Explain the meaning of the term ultrasound.
A student listens to two different sounds, P and Q.
The two different sounds are represented on a computer screen on the same scale.
Fig. 8.1 shows the screens.
State and explain how sound P is different from sound Q.
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