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Q.

Two waves with similar frequencies are added. The traces show the resulting waveforms that occur when two different pairs of waves are added. Graph is for the same time interval in both cases, which of the following statements is TRUE?
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a

On average, the waves on the right had higher frequencies, but the difference between frequencies less

b

On average, the waves on the left had higher frequencies, but the difference between frequencies less

c

On average, the waves on the right had higher frequencies, but the difference between frequencies more

d

On average, the waves on the left had higher frequencies, but the difference between frequencies more

answer is B.

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Detailed Solution

The resultant waveform oscillates with the average frequency and with an oscillating amplitude that changes with a frequency equal to the difference between the original frequencies. These oscillations in the amplitude are known as beats.

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