Questions by varun

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Estimate the speed of sound in air at standard temperature and pressure. The mass of 1 mole of air is `29.0 ×10^(–3)`

asked Mar 19, 2022 in 11th Physics

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A pipe, 30.0 cm long, is open at both ends. Which harmonic mode of the pipe resonates a 1.1 kHz source? Will resonance with the same source be observed if one end of the pipe is closed ? Take the speed of sound in air as 330 m

asked Mar 19, 2022 in 11th Physics

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Two sitar strings A and B playing the note ‘Dha’ are slightly out of tune and produce beats of frequency 5 Hz. The tension of the string B is slightly increased and the beat frequency is found to decrease to 3 Hz. What is the original frequency of B if the frequency of A is 427 Hz

asked Mar 19, 2022 in 11th Physics

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A rocket is moving at a speed of 200 m `s^(–1)` towards a stationary target. While moving, it emits a wave of frequency 1000 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. Calculate (1) the frequency of the sound as detected by the target and (2) the frequency of the echo as detected by the

asked Mar 19, 2022 in 11th Physics

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A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other

asked Mar 19, 2022 in 11th Physics

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A stone dropped from the top of a tower of height 300 m splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m `s^(–1)` ? (g = 9.8 m

asked Mar 19, 2022 in 11th Physics

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A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20 °C = 343 m

asked Mar 19, 2022 in 11th Physics

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Use the formula `v=sqrt((γP)/ρ)` to explain why the speed of sound in air (a) is independent of pressure, (b) increases with temperature, (c) increases with

asked Mar 19, 2022 in 11th Physics

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You have learnt that a travelling wave in one dimension is represented by a function y = f (x, t) where x and t must appear in the combination x – v t or x + v t, i.e. y = f (x ± v t). Is the converse true? Examine if the following functions for y can possibly represent a travelling wave : (a) `(x – vt )^2` (b) `log [(x + vt)/x_0]` (c) 1/(x +

asked Mar 19, 2022 in 11th Physics

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A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m `s^(–1)` and in water 1486 m

asked Mar 19, 2022 in 11th Physics

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A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7 km `s^(–1)` ? The operating frequency of the scanner is 4.2

asked Mar 19, 2022 in 11th Physics

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A transverse harmonic wave on a string is described by. y(x, t) = 3.0 sin (36 t + 0.018 x + π/4) where x and y are in cm and t in s. The positive direction of x is from left to right. (a) Is this a travelling wave or a stationary wave ? If it is travelling, what are the speed and direction of its propagation ? (b) What are its amplitude and frequency ? (c) What is the initial phase at the origin ? (d) What is the least distance between two successive crests in the wave

asked Mar 19, 2022 in 11th Physics

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For the wave described in Exercise 15.8, plot the displacement (y) versus (t) graphs for x = 0, 2 and 4 cm. What are the shapes of these graphs? In which aspects does the oscillatory motion in travelling wave differ from one point to another: amplitude, frequency or phase

asked Mar 19, 2022 in 11th Physics

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For the travelling harmonic wave y(x, t) = 2.0 cos 2π (10t – 0.0080 x + 0.35) where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of (a) 4 m, (b) 0.5 m, (c) λ/2, (d)

asked Mar 19, 2022 in 11th Physics

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The transverse displacement of a string (clamped at its both ends) is given by `y(x, t) = 0.06 sin((2π)/3x) cos (120 πt)` where x and y are in m and t in s.The length of the string is 1.5 m and its mass is `3.0 ×10^(–2)` kg. Answer the following : (a) Does the function represent a travelling wave or a stationary wave? (b) Interpret the wave as a superposition of two waves travelling in opposite directions. What is the wavelength, frequency, and speed of each wave ? (c) Determine the tension in the

asked Mar 19, 2022 in 11th Physics

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(i) For the wave on a string described in Exercise 15.11, do all the points on the string oscillate with the same (a) frequency, (b) phase, (c) amplitude? Explain your answers. (ii) What is the amplitude of a point 0.375 m away from one

asked Mar 19, 2022 in 11th Physics

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Given below are some functions of x and t to represent the displacement (transverse or longitudinal) of an elastic wave. State which of these represent (i) a travelling wave, (ii) a stationary wave or (iii) none at all: (a) y = 2 cos (3x) sin (10t) (b) `y = 2sqrt(x-vt)` (c) y = 3 sin (5x – 0.5t) + 4 cos (5x – 0.5t) (d) y = cos x sin t + cos 2x sin

asked Mar 19, 2022 in 11th Physics

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A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is `3.5 × 10^(–2)` kg and its linear mass density is `4.0 × 10^(–2)` kg `m^(–1)`. What is (a) the speed of a transverse wave on the string, and (b) the tension in the

asked Mar 19, 2022 in 11th Physics

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A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency 340 Hz) when the tube length is 25.5 cm or 79.3 cm. Estimate the speed of sound in air at the temperature of the experiment. The edge effects may be

asked Mar 19, 2022 in 11th Physics

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A steel rod 100 cm long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod are given to be 2.53 kHz. What is the speed of sound in

asked Mar 19, 2022 in 11th Physics

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