Two sound waves of frequencies 256 Hz and 260 Hz are sounded simultaneously. What is the beat frequency heard by an observer?
Answer and explanation
Correct answer: B. 4 Hz
- Step 1: Beat frequency formula: f_beat = |f1 - f2|. Step 2. f_beat = |260 - 256| = 4 Hz. Answer: 4 Hz. Why not the others: 258 Hz is the average carrier frequency; 516 Hz is the sum.
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