The sketches I to IV in Fig. show sound waves, all formed in the same time interval. Which diagram shows a bass (low frequency) note?

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III

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Solution

The correct option is A II
Frequency is the speed of the vibration, and this determines the pitch of the sound. It is only useful or meaningful for musical sounds, where there is a strongly regular waveform. In other words, frequency is the number of cycles per second in a particular wave pattern.
In the question, figure II has the least number of cycles, and hence, it has a low frequency or a base note.

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