Sound waves (node and antinodes)

In summary, the sand particles vibrate with maximum amplitude at the antinodes and have a displacement of 0 at the nodes. However, due to the air flow created by the standing sound wave, the particles are swept towards the nodes and accumulate there. This can be observed in the provided video.
  • #1
kelvin macks
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Homework Statement



for part a , since we know that the sand particles will vibrate will max amplitude at antinode and the displacement of partcles is 0 at node. then , the sand should heap at antinode . why the solution gives the sand heap at nodes?

Homework Equations





The Attempt at a Solution

 

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  • #2
The standing sound wave means that the air vibrates with high amplitude at the antinodes, and moves with high speed there. At the nodes, the air is in rest. The air flow takes the dust particles with itself, sets them into motion. It is like the broom sweeping dust or leaves. Watch video, especially from the 10th second. Where do the dust particles (leaves) accumulate? https://www.youtube.com/watch?v=iM_YIMC6Ic4

ehild
 
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  • #3
ehild said:
The standing sound wave means that the air vibrates with high amplitude at the antinodes, and moves with high speed there. At the nodes, the air is in rest. The air flow takes the dust particles with itself, sets them into motion. It is like the broom sweeping dust or leaves. Watch video, especially from the 10th second. Where do the dust particles (leaves) accumulate? https://www.youtube.com/watch?v=iM_YIMC6Ic4

ehild

ok, can understand it finally.
 

What are sound waves?

Sound waves are a type of mechanical wave that travels through a medium, such as air or water, and carries energy from one point to another. They are created when an object vibrates, causing disturbances in the surrounding medium.

What are nodes in sound waves?

Nodes are points in a sound wave where the particles of the medium are at rest, meaning they are not moving. This is due to the interference of two waves that have equal amplitudes and opposite phases, resulting in a cancellation of the wave's energy at that point.

What are antinodes in sound waves?

Antinodes are points in a sound wave where the particles of the medium are oscillating with the maximum displacement from their resting position. This occurs when two waves with the same amplitude and phase combine, resulting in an increase in the wave's energy at that point.

How do nodes and antinodes affect sound waves?

Nodes and antinodes can affect the characteristics of sound waves, such as their amplitude and wavelength. For example, nodes can cause a decrease in the amplitude of a sound wave, resulting in a quieter sound. Antinodes, on the other hand, can increase the amplitude and loudness of a sound wave.

Can nodes and antinodes be manipulated or controlled?

Yes, nodes and antinodes can be manipulated and controlled by adjusting the properties of the medium or the source of the sound wave. For example, by changing the frequency or amplitude of a sound wave, the positions of nodes and antinodes can be altered. Additionally, certain techniques such as soundproofing can be used to manipulate the distribution of nodes and antinodes to control the intensity of sound in a given space.

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