An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are λ and f The apparent frequency and wavelength recorded by the observer are respectively
A whistle revolves in a circle with angular speed co =20rad/s using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre (velocity of sound =340m/s)
If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become
Two stationary sources each emitting waves of wavelength λ, an observer moves from one source to another with velocity u. Then number of beats heard by him
Two waves of lengths 50 cm and 51 cm produced 12 beats per sec. The velocity of sound is
A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 Α° between them. The wavelength of the standing wave is
In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 s. The frequency of wave is
Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s , the frequency is
A cylindrical tube, open at both ends has fundamental frequency f in air. The tube is dipped vertically in water, so that half of it is in water. The fundamental frequency ofair column is now
The equation of a sound wave is y=0.0015sin (2.4x+316t). The wavelength of this wave is
Two sound waves having a phase difference of 60° have path difference of
The length of a sonometer wire is 110 cm. Where should the two bridges be placed from to divide the wire in 3 segments whose fundamental frequencies are in the ratio of 1:2: 3?
A source of sound gives 5 beats per second, when sounded with another source of frequency 100 second¯¹ . The second harmonic of the source, together with a source of frequency 205 sec¯¹ gives 5 beats per second. What is the frequency of the source?
Which one of the following represents a wave?
A wave of frequency 100 Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end. The speed of the wave (incident and reflected) is
A source of frequency gives 5 beats/second when sounded with a source offrequency200 Hz. The second harmonic of frequency of 2v source gives 10 beats/second when sounded with a source of frequency 420 Hz. The value of v is
Wave has simple harmonic motion whose period is 4 seconds while another wave which also possesses simple harmonic motion has its period 3 second. If both are combined, then the resultant wave will have the period equal to
A stretched string resonates with tuning fork frequency 512 Hz when length of the string is 0.5 m. The length ofthe string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be
The temperature at which the speed of sound becomes double as was at 27°C is
For production of beats the two sources must have
The frequency of sinusoidal wave y=0.40 cos [2000t +0.80]would be
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are
Two trains move towards each other with the same speed. The speed of sound is 340 m/s. If the height ofthe tone of the whistle of one of them heard on the other changes to 9/8 times, then the speed of each train should be
A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has
If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be
