Two tuning forks P and Q give 4 beats per second. On loading Q lightly with wax, we get 3 beats per second. What is the frequency of Q before and after loading it if the frequency of P is 512 Hz.

Solution

Beat frequency is the difference of frequencies of the two sounding sources and given by, f = f_{2} – f_{1}.

Omaima
It does not make any difference if you take f2 – f1 or f1 – f2. The actual sense of the formula is to find the difference between the two frequencies. However, it is more appropriate to take f2 – f1 if f2 > f1 or f1 – f2 if f1 > f2. Though in both cases, the absolute value of the answer will be same.

Hello plz ive a confusion. In our book f1-f2 formula is used while you used f2-f1??

Omaima

It does not make any difference if you take f2 – f1 or f1 – f2. The actual sense of the formula is to find the difference between the two frequencies. However, it is more appropriate to take f2 – f1 if f2 > f1 or f1 – f2 if f1 > f2. Though in both cases, the absolute value of the answer will be same.

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