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qUESTIONS

A uniform string of length 20m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is

A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is v m / sec . The speed of source will be

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18cm during winter. Representing the same experiment during summer, she measures the column length to be x cm for the second resonance.

A train moves towards a stationary observer with a speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the speed of the train is reduced to 17 m/s, the frequency registered is f2. If the speed of sound is 340 m/s , then the ratio f1/f2 is

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle, if it is given that motor cyclist does not observes any beats. (velocity of sound in air = 330 m/s)

A train is moving on a straight track with speed 20m/s. It is blowing its whistle at the frequency of 1000Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is close to:

Two waves y1 =Acos (0.5πx-100πt) and y2=Acos(0.46 πx-92πt) are travelling in a pipe placed along x-axis, where x is in metres and t is in seconds. Find the number of times intensity is maximum in time interval of 1 s

A police car with a siren of frequency 8kHz is moving with uniform velocity 36 km/h towards a tall building which reflects the sound waves. Speed of sound in air is 320m/s. Frequency of siren heard by car driver is

A travelling harmonic wave is represented by the equation y(x,t)=10^3sin(50t+2x), where x and y are in meter and t is in seconds. Which of the following is a correct statement about the wave?

Two monatomic ideal gases 1 and 2 of molecular mass m1 and m2, respectively are enclosed in separate containers kept at the same temperature. The ratio of speed of the sound in gas 1 to that in gas 2 is given by.

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