Wave Motion 5 Question 11

11. How many times does an observer hear maximum intensity in one second?

(2006, 5M)

(a) 4

(b) 10

(c) 6

(d) 8

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Answer:

Correct Answer: 11. (a)

Solution:

  1. In one second number of maximas is called the beat frequency. Hence,

$$ f _b=f _1-f _2=\frac{100 \pi}{2 \pi}-\frac{92 \pi}{2 \pi}=4 Hz $$



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