# 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: Â Standing Waves |
Â 55%
From NCERT
NEET - 2023
Hints

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: Â Standing Waves |
Â 70%
From NCERT
NEET - 2023
Hints

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: Â Standing Waves |
Â 66%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Standing Waves |
Â 53%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Travelling Wave on String |
Â 69%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
 Assertion (A): A glass tube partially filled with water represents an open organ pipe. Reason (R): The open end corresponds to an antinode and the end in contact with water, to a node.
In the light of the above statements, choose the correct answer from the options given below:
 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True and (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 (A) is False but (R) is True.
Subtopic: Â Travelling Wave on String |
Â 61%
From NCERT
NEET - 2024
Hints

The displacement of a traveling wave $$y=C\sin\frac{2\pi}{\lambda}({at}-x)$$ where is time, $$x$$ is distance and $$\lambda$$ is the wavelength, all in S.I. units. Then the frequency of the wave is:
1. $$\frac{2\pi\lambda}{a}$$
2. $$\frac{2\pi a}{\lambda}$$
3. $$\frac{\lambda}{a}$$
4. $$\frac{a}{\lambda}$$
Subtopic: Â Wave Motion |
Â 81%
From NCERT
NEET - 2024
Hints

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: Â Standing Waves |
Â 82%
From NCERT
NEET - 2020
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Beats |
Â 66%
From NCERT
NEET - 2020
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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: Â Speed of Sound |
Â 74%
From NCERT
NEET - 2019
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints