If beat frequency is 2 Hz, what is the time interval between success waxings?Ī sonometer wire under a tension of 40 N vibrates in unison with a tuning fork of frequency 384 Hz. Calculate the difference in wavelengths of these waves. The velocity of sound in air is 326.4 m/s. Two tuning forks of frequencies 320 Hz and 340 Hz are sounded together to produce a sound wave. When tension changes to 256 N, it is tuned with the same fork, the number of beats remain unchanged. Wire having tension 225 N produces six beats per second when it is tuned with a fork. The sum of the minimum and maximum intensities is _. Two light waves of intensities 'I 1' and 'I 2' having same frequency pass through same medium at a time in same direction and interface. The velocity of sound in a gas in which two wavelengths 4.08m and 4.16m produce 40 beats in 12s, will be _. Prove that the frequency of beats is equal to the difference between the frequencies of the two sound notes giving rise to beats. When two waves of almost equal frequencies n 1 and n 2 reach at a point simultaneously, what is the time interval between successive maxima?

What is the frequency of the tuning fork B when not loaded? If B is loaded with wax the number of beats is again 5 per second. The frequency of the note is _Ī tuning fork A, marked 512 Hz, produces 5 beats per second, where sounded with another unmarked tuning fork B. The initial frequency of each wire is _Ī note produces 4 beat/s with a tuning fork of frequency 510 Hz and 6 beat/s with a fork of frequency 512 Hz. If the tension in one of the wires is increased by 2%, five beats are produced per second by the two vibrating wires. Two identical wires are vibrating in unison. The air column in the pipe can not resonate for a frequency (Neglect end correction, speed of sound in air = 340 m/s) 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 _Ī pipe open at both ends has a length of 1m. The speed of each wave is _.įor formation of beats, two sound notes must have _.Ī 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. Two waves of wavelength 2 m and 2.02 m, with the same speed superimpose to produce 2 beats per second. What is the frequency of tuning fork A before the wax is stuck to it? When a little wax is stuck to a prong of fork A, the number of beats heard per second becomes 2. The frequency of B will be _Ī tuning fork 'A' produces 5 beats per second with a tuning fork of frequency 480 Hz. When A is slightly loaded with wax, they produce 2 beats when sounded again. If two tuning forks A and B are sounded together, they produce 4 beats per second. Calculate the frequencies of the first and the last fork.Įxplain the production of beats and deduce analytically the expression for beats frequency. Each fork gives 4 beats per second with the next one and the frequency of last fork is twice that of the first. If their frequencies are also identical and are equal to 540 Hz, what will be the phase difference between the waves at points 3.5 m from one source and 3 m from the other if the sources are in phase?Ī set of 8 tuning forks is arranged in a series of increasing order of frequencies. Two sound waves travel at a speed of 330 m/s. State any four applications of Doppler effect (D) source and listener move towards each other. Īpparent frequency of the sound heard by a listener is less than the actual frequency of sound emitted by source. (D) both are moving in same direction with different velocities (C) both are moving in opposite directions. (B) there is a relative motion between source and observer.

In Doppler effect of light, the term “red shift” is used for _.ĭoppler effect is not applicable when _. If the original frequency of A is 324 Hz, what is the frequency of B?Įxplain why (or how) A violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, The tension in the string A is slightly reduced and the beat frequency is found to reduce to 3 Hz.

Two sitar strings A and B playing the note ‘ Ga’ are slightly out of tune and produce beats of frequency 6 Hz. Find the velocity of sound in the air and frequency of the tuning fork. Each of these notes produces 8 beats per second with a tuning fork of fixed frequency. Wavelengths of two notes in the air are`^m` and `^m`.

Beat frequency of two tuning forks