8. Suppose that during any period of ¼ second there is one instant at which the crests or troughs of component waves are exactly in phase and maximum reinforcement occurs. How many beats will occur in 1 second?
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4 beats will occur in 1 second
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The right answer of the given question is option d) 4.
The explanation is that beat is an interference pattern between two sounds of a bit different frequencies that is perceived of a periodic variation in terms of volume.
Therefore, if one beat is occurring in a ¼ of a second then it means a second is divided in four parts and one beat occur in each part.
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