A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produced on the screen are shown in Figure. Which trace is due to the loudest sounds ? Give reason for your answer :

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Solution

The trace b has the loudest sound because the amplitude is more among the three traces given in the question. Amplitude is the size of the vibration, and this determines how loud the sound is. Larger vibrations make a louder sound. The amplitude of a wave is measured as the height from the equilibrium point to the highest point of a crest or the depth from the equilibrium point to the lowest point of a trough.

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