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qUESTIONS

A boy is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after 1.2 sec and 3.6 sec respectively, the distance between the cliffs is (Take velocity of sound = 340 m/s)

A man standing 48 m away from a wall fires a gun. Calculate the time after which an echo is heard (The speed of sound in air is 320 ms-¹)

If a stationary listener notes a change of 25 % in the frequency of a whistle of an engine coming towards him. then the velocity of the engine is (Take velocity of sound 332 m/s

The speed of sound in mercury at a certain temperature is 1450 m/s. Given the density of mercury as 13.6 x 10^3 kg/m^3, the bulk modulus of mercury is

The velocity of sound in air at 20 °C and 1 atm pressure is 344.2 m/s. At 40 °C and 2 atm pressure, the velocity of sound in air is approximately.

The displacement of a wave travelling in the x direction is y = 10^-4 sin [600t -2x + π/3] m Where x is in metre and t in second. The speed of the wave is

A bat emits ultrasonic sound of frequency 200 kHz. If this sound meets a water surface then what will be the wavelength of reflected sound in air and transmitted sound in water respectively?

The equation of a simple harmonic progressive wave of amplitude 0.02 m, period 0.008 s and wavelength 0.5 m is

When sound is produced in an airplane moving with a velocity of 250 m/s horizontally, its echo is heard after 12 sec. If velocity of sound in air is 300 ms^-1, then the elevation of the aircraft is.

A train blows its whistle as it approaches a stationary listener. The frequency of the whistle apparent to the listener is n₁ if the train’s speed is 34 m/s and n₂ if the speed is 17 m/s. If the speed of sound in air is 340 m/s, the ratio n1/n2 is.

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