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Q. No.While walking on the Moon, you cannot hear the sound of stones cracking behind you because:
| 1. | Sound waves need a medium to travel through. |
| 2. | Sound waves are transverse. |
| 3. | The acceleration due to gravity on the Moon is very small. |
| 4. | Sound waves are longitudinal. |
Subtopic: Â Types of Waves |
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Level 1: 80%+
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Column I shows the expression for displacement in different kinds of waveforms (in \(x,t\)) while columns II & III describe their nature. Match them: All the quantities are in SI units.
| Column-I | Column-II | Column-III | |||||
| (A) | \(\small0.04\sin(10x+600t) \) | (P) | sinusoidal waveform | (I) | speed \(=30~\text{m/s}\) | ||
| (B) | \(\small0.008\sin^2(10x-300t)\) | (Q) | wave pulse | (II) | speed \(=60~\text{m/s}\) | ||
| (C) | \(\small\dfrac{3\times10^{-3}}{(10x+600t)^2+400}\) | (R) | combination of waveforms | (III) | moving along positive \(x\) | ||
| (D) | \(\small(2\times10^{-3})\sin10x \cdot\cos300t\) | (IV) | moving along negative \(x\) | ||||
| (V) | moving in the opposite direction | ||||||
| 1. | A-P,II,III; B-Q,I,IV; C-Q,II,III; D-R,I |
| 2. | A-P,II,IV; B-P,I,III; C-Q,II,IV; D-R,I,V |
| 3. | A-P,I,III; B-Q,I,IV; C-R,III; D-R,I,IV |
| 4. | A-P,I,III; B-Q,I,III; C- R-II,IV; D-R,I,V |
Subtopic: Â Types of Waves |
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When a sound wave travels from air into water (or vice-versa), then:
| 1. | its frequency changes |
| 2. | its wavelength changes |
| 3. | both frequency and wavelength change |
| 4. | both frequency and wavelength remain unchanged |
Subtopic: Â Types of Waves |
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Level 2: 60%+
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Which of the following is not possible for sound waves in air?
1. beats
2. interference
3. diffraction
4. polarization
Subtopic: Â Types of Waves |
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Ocean waves strike a beach once every \(4~\text{s},\) and the distance between successive wave crests is \(12~\text{m}.\) What is the velocity of the waves as they move toward the shore?
| 1. | \(3~\text {m/s}\) | 2. | \(4~\text {m/s}\) |
| 3. | \(12~\text {m/s}\) | 4. | \(48~ \text {m/s}\) |
Subtopic: Â Types of Waves |
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Level 2: 60%+
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Which of the following expressions represents a wave?
| 1. | \(y=A \sin (\omega t-kx)\) |
| 2. | \(y=A \cos ^2(a t-bx+c)+A \sin ^2(at-bx+c)\) |
| 3. | \(y=A \sin kx\) |
| 4. | \(y=A \sin \omega t\) |
Subtopic: Â Types of Waves |
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