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We cannot hear echo in a room.

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Why do the stages of large auditoriums gave curved

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Show that Doppler effect in sound is

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An organ pipe P1 closed at one end vibrating in its first overtone and another pipe P2 open at both the ends vibrating in its third overtone are in resonance with a given tuning fork. Find the ratio of length of P1 and

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A simple Romanic wave has the equation`Y = 0.30 Sin (314 t – 1.57x)`t = sec, x = meters, y = cm. Find the frequency and wavelength of this wave.Another wave has the equation`Y1 = 0.1 Sin (314 t – 1.57x + 1.57)`Deduce the phase difference and ratio of intensities of the above two

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Two parts of a Sonometer wire divided by a movable knife differ by 2 mm and produce one beat per record when sounded together. Find their frequencies if the whole length of the wire is 1

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The component waves producing a stationary wave have amplitude, Frequency and velocity of 8 cm, 30HZ and 180 cm/s respected. Write the equation of the stationary

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A wine of density a g/`cm^3` is stretched between two clamps 1 m apart while subjected to an extension of 0.05 cm. What is the lowest frequency of transverse vibration in the wire? Let young’s Modulus = `y = 9 xx10^(10)N`/`m^2`

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Write the characteristics of

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Draw displacement time graph for uniformly accelerated motion. What is its

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Sameer went on his bike from Delhi to Gurgaon at a speed of 60km/hr and cameback at a speed of 40km/hr. what is his average speed for entire

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What causes variation in velocity of a

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Figure. Shows displacement – time curves I and II. What conclusions do you draw from these

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Displacement of a particle is given by the expression `x = 3t^2 + 7t – 9`, where x is in meter and t is in seconds. What is

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A particle is thrown upwards. It attains a height (h) after 5 seconds and again after 9s comes back. What is the speed of the particle at a height

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Draw displacement time graph for a uniformly accelerated motion? What is its

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The displacement x of a particle moving in one dimension under the action of constant force is related to the time by the equation where x is in meters and t is in seconds. Find the velocity of the particle at `(1) t = 3s (2) t =

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A balloon is ascending at the rate of 4.9m/s. A pocket is dropped from the balloon when situated at a height of 245m. How long does it take the packet to reach the ground? What is its final

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A car moving on a straight highway with speed of 126km/hr. is brought to Two balls of differevelocitystop within a distance of 200m. What is the retardation of the car (assumed uniform) and how long does it take for the car to

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What is the angle between two forces of 2N and 3N having resultant as

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