Question
Question: An accurate and reliable audio oscillator is used to standardize a tuning fork marked as 512 Hz. Whe...
An accurate and reliable audio oscillator is used to standardize a tuning fork marked as 512 Hz. When the oscillator reading is 514, two beats are heard per second. When the oscillator reading is 510, the beat frequency is 6 Hz. The frequency of the tuning fork is
A
506
B
510
C
516
D
158
Answer
516
Explanation
Solution
It should be remembered that the oscillator reading is correct and the tuning fork frequency marked is wrong. When the oscillator reading is 514, two beats are heard. Hence the frequency of the tuning fork is 514 ± 2 = 516 or 512. When the oscillator reading is 510, the frequency of the tuning fork is 510 ± 6 = 516 or 504. The common value is 516. Hence the frequency is 516 Hz.