The beat frequency produced by two waves equals which combination of their frequencies?
ATheir dividend
BTheir diameter
CTheir difference
DTheir doubling
Answer & Solution
Correct answer: C. Their difference
1. Two slightly different frequencies together produce a slow throbbing.
2. The throb rate depends on how far apart the two frequencies are.
3. The beat frequency is given by the first frequency minus the second.
4. So the answer is their difference.
_Source: NCERT Class XI Physics Part II, Ch 14 'Waves'_
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