The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is:
 1 $$3:1$$ 2 $$1:2$$ 3 $$2:1$$ 4 $$1:3$$
Subtopic:  Standing Waves |
56%
From NCERT
NEET - 2023
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The $$4^\mathrm{th}$$ overtone of a closed organ pipe is the same as that of the $$3^\mathrm{rd}$$ overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is:
 1 $$8:9$$ 2 $$9:7$$ 3 $$9:8$$ 4 $$7:9$$
Subtopic:  Standing Waves |
70%
From NCERT
NEET - 2023
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If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is:
1. $$1:2$$
2. $$1:1$$
3. $$\sqrt{2}:1$$
4. $$1:\sqrt{2}$$
Subtopic:  Travelling Wave on String |
69%
From NCERT
NEET - 2022
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A string of length $$l$$ is fixed at both ends and is vibrating in second harmonic. The amplitude at antinode is $$2$$ mm. The amplitude of a particle at a distance $$l/8$$ from the fixed end is:

1. $$2\sqrt2~\text{mm}$$
2. $$4~\text{mm}$$
3. $$\sqrt2~\text{mm}$$
4. $$2\sqrt3~\text{mm}$$

Subtopic:  Standing Waves |
53%
From NCERT
NEET - 2022
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An organ pipe filled with a gas at $$27^\circ \text{C}$$ resonates at $$400$$ Hz in its fundamental mode. If it is filled with the same gas at $$90^\circ \text{C},$$ the resonance frequency at the same mode will be:
 1 $$420$$ Hz 2 $$440$$ Hz 3 $$484$$ Hz 4 $$512$$ Hz
Subtopic:  Standing Waves |
66%
From NCERT
NEET - 2022
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In a guitar, two strings $$A$$ and $$B$$ made of same material are slightly out of tune and produce beats of frequency $$6~\text{Hz}$$. When tension in $$B$$ is slightly decreased, the beat frequency increases to $$7~\text{Hz}$$.  If the frequency of $$A$$ is $$530~\text{Hz}$$, the original frequency of $$B$$ will be:

 1 $$524~\text{Hz}$$ 2 $$536~\text{Hz}$$ 3 $$537~\text{Hz}$$ 4 $$523~\text{Hz}$$
Subtopic:  Beats |
66%
From NCERT
NEET - 2020
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The length of the string of a musical instrument is $$90$$ cm and has a fundamental frequency of $$120$$ Hz. Where should it be pressed to produce a fundamental frequency of $$180$$ Hz?

 1 $$75$$ cm 2 $$60$$ cm 3 $$45$$ cm 4 $$80$$ cm
Subtopic:  Standing Waves |
82%
From NCERT
NEET - 2020
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A tuning fork with a frequency of $$800$$ Hz produces resonance in a resonance column tube with the upper end open and the lower end closed by the water surface. Successive resonances are observed at lengths of $$9.75$$ cm, $$31.25$$ cm, and $$52.75$$ cm. The speed of the sound in the air is:

 1 $$500$$ m/s 2 $$156$$ m/s 3 $$344$$ m/s 4 $$172$$ m/s
Subtopic:  Speed of Sound |
74%
From NCERT
NEET - 2019
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A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $$27^{\circ}\mathrm{C}$$, to successive resonances are produced at $$20$$ cm and $$73$$ cm column length. If the frequency of the tuning fork is $$320$$ Hz, the velocity of sound in air at $$27^{\circ}\mathrm{C}$$ is:

 1 $$330$$ m/s 2 $$339$$ m/s 3 $$350$$ m/s 4 $$300$$ m/s
Subtopic:  Speed of Sound |
72%
From NCERT
NEET - 2018
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The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is $$20~\text{cm}$$, the length of the open organ pipe is:
1. $$13.2~\text{cm}$$
2. $$8~\text{cm}$$
3. $$12.5~\text{cm}$$
4. $$16~\text{cm}$$

Subtopic:  Standing Waves |
62%
From NCERT
NEET - 2018
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