Which of the following statements are correct regarding longitudinal waves-Compressions and rarefactions are formedParticles oscillate about their mean positionsParticles oscillate perpendicular to the direction of wave propagationParticle oscillate parallel to the direction of wave propagation

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Standard VI

Physics

Sound Produced by Us

Which of the ...

Question

Which of the following statements are correct regarding longitudinal waves?

Compressions and rarefactions are formed

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Particles oscillate about their mean positions

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Particles oscillate perpendicular to the direction of wave propagation

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Particle oscillate parallel to the direction of wave propagation

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Solution

The correct options are
A Compressions and rarefactions are formed
B Particles oscillate about their mean positions
D Particle oscillate parallel to the direction of wave propagation
In a longitudinal wave, the particles of the medium oscillate about their mean positions, and the direction of their oscillation is always parallel to the direction of the propagation of the wave. Also, when the particles vibrate in such a manner, they form compressions and rarefactions.

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Similar questions

Q. Assertion - Sound wave is an example of longitudinal wave.
Reason - In longitudinal waves, the constituents of the medium oscillate perpendicular to the direction of wave propagation.

Q. Assertion :Waves produced in a cylinder containing a liquid by moving its piston back and forth are longitudinal waves. Reason: In longitudinal waves, the particle of the medium oscillate parallel to the direction of propagation of the wave.

Statement 1: In air, the particles vibrate around their mean positions along the direction of propagation of sound waves.

Statement 2: In longitudinal waves, the particles move perpendicular to the direction of the wave propagation.

No.	Column 1	Column 2	Column 3
1.	Transverse wave	(a) Particles oscillate parallel to direction of propagation	(i) Waves produced in slinky.
2.	Longitudinal waves.	(b) Particles oscillate perpendicular to direction of propagation	(ii) Frequency less than 20 Hz.
3.	Ultrasound.	(c) Echo formation is heard under particular conditions.	(iii) Waves produced in string
4.	Infrasound	(d) High frequency waves.	(iv) Frequency between 20 Hz and 20000 Hz.
5.	Audible frequency	(e) Low frequency waves	(v) Frequency greater than 20000 Hz.

If medium particles oscillate up and down about their rest positions in a direction perpendicular to the direction of propagation of the wave, then the wave is called transverse wave. For example, light is a transverse wave.

BUT IN THE CASE OF LIGHT, THERE ARE NO MEDIUM PARTICLES THAT VIBRATE. SO, HOW CAN IT BE CALLED A TRANSVERSE WAVE ?

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