# <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The fundamental frequency of an open organ pipe is 200 Hz. If one end of the pipe is closed, its fundamental frequency becomes: 1. 100 Hz 2. 200 Hz 3. 50 Hz 4. 400 Hz

Subtopic:  Standing Waves |
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When height increases, the velocity of sound decreases:

 1 due to the decrease in pressure. 2 due to a decrease in temperature. 3 as a result of a decrease in both temperature and pressure 4 statement is wrong.

Subtopic:  Speed of Sound |
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A sufficiently long-closed organ pipe has a small hole at its bottom. Initially, the pipe is empty. Water is poured into the pipe at a constant rate. The fundamental frequency of the air column in the pipe:

 1 Constantly increases 2 Increases at first, then becomes constant. 3 Constantly decreases 4 Decreases at first, then becomes constant.

Subtopic:  Standing Waves |
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Which one of the following graphs represents correctly the given wave equation at the origin?

$\mathrm{y}=2\sqrt{3}\mathrm{sin}\left(2\mathrm{\pi x}-3\mathrm{\pi t}+\frac{\mathrm{\pi }}{3}\right)$

 1 2 3 4
Subtopic:  Wave Motion |
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$$y-x$$ graph of a travelling wave along $$+x$$ direction is shown at any instant $$t$$(Symbols have their usual meanings). The velocity of a particle at:

 1 $$x_1$$ is downward 2 $$x_2$$  is downward 3 $$x_3$$  is upward 4 $$x_4$$  is downward

Subtopic:  Wave Motion |
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Stationary waves can be obtained in an air column even if interfering waves have different:

1. Amplitude

2. Wavelength

3. Velocity

4. Frequency

Subtopic:  Standing Waves |
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A sound wave is passed through a chamber. If the r.m.s. speed of molecules in a gas is v1 and the speed of sound is v2 in the gas, then:

 1 v1 = v2 2 v1 > v2 3 v1 < v2 4 v1 ≤ v2
Subtopic:  Speed of Sound |
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A string of length l is fixed at one end and free at the other. If it resonates in different modes, then the ratio of frequencies is:

1. 1:2:3: ......

2. 1:3:5:7: ......

3. 1:2:4:8: ..........

4. 1:3:9: ........

Subtopic:  Standing Waves |
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Given below are two statements:

 Statement I: With the displacement wave we can produce a pressure wave. Statement II: Displacement and pressure waves both are having a phase difference of $$\frac{\pi }{2}$$.

 1 Statement I is incorrect and Statement II is correct. 2 Both Statement I and Statement II are correct. 3 Both Statement I and Statement II are incorrect. 4 Statement I is correct and Statement II is incorrect.
Subtopic:  Pressure Wave in Sound |
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If the transverse displacement of a string clamped at both ends is given by y(x,t)=12(cm) sin(6.28x)cos(3.14 t), where x is in cm and t is in seconds, then which of the following is not true?

 1 The velocity of the component wave is 0.5 cm/s. 2 The amplitude of one of the component waves is 6 cm. 3 The distance between two consecutive nodes is 0.5 cm. 4 x= 0.25 cm is the first node except the nodes at the ends.

Subtopic:  Standing Waves |
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