Advertisements
Advertisements
Question
A tuning fork A, marked 512 Hz, produces 5 beats per second, where sounded with another unmarked tuning fork B. If B is loaded with wax the number of beats is again 5 per second. What is the frequency of the tuning fork B when not loaded?
Solution
Given that, vA = 512
On loading, frequencies of B decreased
So, in the first case v1 = 5
⇒ vB = vA ± 5
When B is loaded, the frequency of B becomes,
⇒ vB = 512 ± 5
We can write it as,
⇒ vB = 507 or vB = 517
On load in the frequency of B decreased by 507 to lower value of the number of beats will increase so vB ≠ 507
If vB = 517 then its frequency decreases by 10 Hz by then the number of beats will also be the same as 512 – 507 = 5.
Thus, the frequency of the tuning fork B when not loaded is 517 Hz.
APPEARS IN
RELATED QUESTIONS
Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
State any four applications of Doppler effect
State any four applications of beats.
Explain the production of beats and deduce analytically the expression for beats frequency.
When the observer moves towards the stationary source with velocity, 'V1', the apparent frequency of the emitted note is 'F1'. When the observer moves away from the source with velocity 'V1', the apparent frequency is 'F2'. If 'V' is the velocity of sound in air and `"F"_1/"F"_2 = 4` then `"V"/"V"_1 = ?`
For formation of beats, two sound notes must have ______.
A set of 25 tuning forks is arranged in order of decreasing frequencies. Each fork produces 3 beats with succeeding one. If the first fork is octave of last, then the frequency of 1st and 15th fork in Hz is ______.
A pipe closed at one end has a length of 1m and at its open end, 0.25 m long uniform string is vibrating in its third harmonic and resonates with a fundamental frequency of pipe. If the tension in the string is 100 N and the speed of sound is 340 `m/s`, then the mass of the string is near ______
A pipe open at both ends has a length of 1m. The air column in the pipe can not resonate for a frequency (Neglect end correction, speed of sound in air = 340 m/s)
Two identical wires are vibrating in unison. If the tension in one of the wires is increased by 2%, five beats are produced per second by the two vibrating wires. The initial frequency of each wire is ______
`(sqrt(1 . 0.2) ≑ 1 . 0.1)`
