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Waves

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Q.

Velocity of sound in an open organ pipe is 330 m/s. The frequency of wave is 1.1 kHz and the length of tube is 30 cm. To which harmonic does this frequency corresponds 

Q.

A conveyor belt moves to the right with speed v = 300 m/min. A pieman puts pies on the belt at a rate of 20 per minutes while walking with speed 30 m/min towards a receiver at the other end. The frequency with which they are received by the stationary receiver is :    

Q.

A string of mass 0.2 kg/m has length l = 0.6 m is fixed at both ends and stretched such that it has a tension of 80 N. The string vibrates in 3 segments with maximum amplitude of 0.5 cm. The maximum transverse velocity amplitude is :

Q.

A string fixed at both ends is vibrating in the lowest mode of vibration for which a point at quarter of its length from one end is a point of maximum displacement. The frequency of vibration in this mode is 100 Hz. What will be the frequency emitted when it vibrates in the next mode such that this point is again a point of maximum displacement?    

Q. Waves?

Waves