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An Open Organ Pipe of Length L Vibrates in Its Fundamental Mode. the Pressure Variation is Maximum - Physics

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प्रश्न

An open organ pipe of length L vibrates in its fundamental mode. The pressure variation is maximum

पर्याय

  • at the two ends

  • at the middle of the pipe

  • at distance L/4 inside the ends

  • at distances L/8 inside the ends.

MCQ
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उत्तर

at the middle of the pipe

For an open organ pipe in fundamental mode, an anti-node is formed at the middle, where the amplitude of the wave is maximum. Hence, the pressure variation is also maximum at the middle.

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Reflection of Waves - Standing Waves and Normal Modes
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 16: Sound Waves - MCQ [पृष्ठ ३५२]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 16 Sound Waves
MCQ | Q 9 | पृष्ठ ३५२

संबंधित प्रश्‍न

A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source? Will the same source be in resonance with the pipe if both ends are open? (Speed of sound in air is 340 m s–1).


Explain why (or how) In a sound wave, a displacement node is a pressure antinode and vice versa,


A 2 m long string fixed at both ends is set into vibrations in its first overtone. The wave speed on the string is 200 m s−1 and the amplitude is 0⋅5 cm. (a) Find the wavelength and the frequency. (b) Write the equation giving the displacement of different points as a function of time. Choose the X-axis along the string with the origin at one end and  t = 0 at the instant when the point x = 50 cm has reached its maximum displacement.


The number of possible natural oscillations of the air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz? (v = 340 m/s)


Water waves produced by a motor boat sailing in water are ______.


The displacement of a string is given by y (x, t) = 0.06 sin (2πx/3) 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.

  1. It represents a progressive wave of frequency 60 Hz.
  2. It represents a stationary wave of frequency 60 Hz.
  3. It is the result of superposition of two waves of wavelength 3 m, frequency 60 Hz each travelling with a speed of 180 m/s in opposite direction.
  4. Amplitude of this wave is constant.

Which of the following statements are true for a stationary wave?

  1. Every particle has a fixed amplitude which is different from the amplitude of its nearest particle.
  2. All the particles cross their mean position at the same time.
  3. All the particles are oscillating with same amplitude.
  4. There is no net transfer of energy across any plane.
  5. There are some particles which are always at rest.

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An organ pipe of length L open at both ends is found to vibrate in its first harmonic when sounded with a tuning fork of 480 Hz. What should be the length of a pipe closed at one end, so that it also vibrates in its first harmonic with the same tuning fork?


The pattern of standing waves formed on a stretched string at two instants of time are shown in figure. The velocity of two waves superimposing to form stationary waves is 360 ms–1 and their frequencies are 256 Hz.

  1. Calculate the time at which the second curve is plotted.
  2. Mark nodes and antinodes on the curve.
  3. Calculate the distance between A′ and C′.

Show that when a string fixed at its two ends vibrates in 1 loop, 2 loops, 3 loops and 4 loops, the frequencies are in the ratio 1:2:3:4.


Two closed end pipes when sounded together produce 5 beat per second. If their length are in the ratio 100 : 101, then fundamental notes produced by them are ______.


A tuning fork is vibrating at 250 Hz. The length of the shortest closed organ pipe that will resonate with the tuning fork will be ______ cm.

(Take the speed of sound in air as 340 ms-1.)


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