Two vibrating strings ' ' and ' ' produce beats of frequency . The beat frequency is found to reduce to if the tension in the string is slightly reduced. If the original frequency of is , then the frequency of ' is
A source of sound gives beats per second when sounded with another source of frequency The second harmonic of the source together with a source of frequency gives beats per second. The frequency of the source is
Two sound waves with wavelengths and , respectively, each propagates in gas with velocity . The number of beats that can be expected from them per second is
A set of tuning forks is arranged in a series of increasing frequencies. If each fork gives beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of last fork is _____ .
A tuning fork of unknown frequency produces with a fork of known frequency . When fork is filed, the beat frequency decreases to . What is the frequency of fork ?
A uniform rope of length and mass , hangs vertically from a rigid support. A block of mass is attached to the free end of the rope. A transverse pulse of wavelength is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is . The ratio is:
In a guitar, two strings and made of same material are slightly out of tune and produce beats of frequency . When tension in is slightly decreased, the beat frequency increases to . If the frequency of is , the original frequency of will be:
A closed organ pipe and an open organ pipe of same length produce when they are set into vibrations together in fundamental mode. The length of open pipe is now halved and that of closed pipe is doubled. The number of beats produced will be
A tuning fork vibrates with frequency and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe? (speed of sound in air is )
An observer is riding on a bicycle and moving towards a hill at . He hears a sound from a source at some distance behind him directly as well as after its reflection from the hill. If the original frequency of the sound as emitted by source is and velocity of the sound in air is , the beat frequency between the two sounds heard by observer will be _____ .
Two tuning forks have frequencies and respectively. On sounding these forks together, the time interval between two successive maximum intensities will be _______.
Two men are walking along a horizontal straight line in the same direction. The man in front walks at a speed and the man behind walks at a speed . A third man is standing at a height above the same horizontal line such that all three men are in a vertical plane. The two walking men are blowing identical whistles which emit a sound of frequency . The speed of sound in air is . At the instant, when the moving men are apart, the stationary man is equidistant from them. The frequency of beats in , heard by the stationary man at this instant, is __________.
Two loudspeakers and are located apart and emit sound at frequencies and , respectively. A car is initially at a point , away from the midpoint of the line and moves towards constantly at along the perpendicular bisector of . It crosses and eventually reaches a point , away from . Let represent the beat frequency measured by a person sitting in the car at time . Let be the beat frequencies measured at locations and , respectively. The speed of sound in air is Which of the following statement(s) is (are) true regarding the sound heard by the person?
An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is . The next larger length of the column resonating with the same tuning fork is:
The frequency of two tuning forks and are more and less than that of the tuning fork . When and are sounded together, beats are produced in second. The frequency of tuning fork is
A toy-car, blowing its horn, is moving with a steady speed of , away from a wall. An observer, towards whom the toy car is moving, is able to hear beats per second. If the velocity of sound in air is the frequency of the horn of the toy car is close to
Two sitar strings, and playing the note '' are slightly out of tune and produce beats of frequency . The tension of the string is slightly increased and the beat frequency is found to decrease by . If the frequency of is . The original frequency of is
