Mechanical waves:
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Mechanical waves can be longitudinal or transverse depending on the medium and wave.
A string of length ℓ, fixed at both ends, is vibrating in two segments. The wavelength of the corresponding wave is:
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For two loops on a string fixed at both ends, ℓ = 2(λ/2), so λ = ℓ.
The speed of sound waves having a frequency of 256 Hz, compared with the speed of sound waves having a frequency of 512 Hz is:
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For sound traveling through the same medium, speed is independent of frequency.
The formula for speed of wave on a string is given by v = √(T/μ), where μ is equal to:
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The symbol μ represents linear mass density.
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Sound generally travels fastest in solids and slowest in gases.
Passage of waves from one medium into another is called:
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The change in direction and speed when a wave enters another medium is refraction.
In relation for overtones produced by an open-end organ pipe, fₙ = n f₁, the values of integer n are:
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An open pipe supports all harmonics.
Path difference for constructive interference is:
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Constructive interference occurs when the path difference is an integral multiple of wavelength.
When a sound source moves towards a stationary observer there is:
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The Doppler effect increases observed frequency when the source approaches the observer.
Mark the correct statement:
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All three statements describe valid Doppler-effect situations under the stated conditions.
Overtones produced by a closed-end organ pipe are:
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A closed pipe supports odd harmonics; the fundamental is f.
When two identical traveling waves are superposed, the velocity of the resultant wave:
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Superposition changes the resultant amplitude, not the propagation speed in the same medium.
Transverse waves can propagate:
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Mechanical transverse waves require a medium capable of supporting shear stress.
If a wave oscillator vibrates 10 times in one second with a speed of 10 m/s, then the correct wavelength of the wave is:
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Velocity of sound in vacuum is:
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Sound is a mechanical wave and cannot propagate through vacuum.
The expression v = fλ is valid for all types of:
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Wave speed equals frequency multiplied by wavelength.
The speed of sound wave in a medium depends upon:
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The speed of sound depends on the medium's elastic properties and density.
Beats occur because of:
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Beats result from interference of waves with slightly different frequencies.
Which of the following statement is correct?
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Sound in air is longitudinal; electromagnetic light waves are transverse.
Identify the waves, which do not need any medium for its propagation:
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Electromagnetic waves can propagate through vacuum.
