# Tag Info

### How can sound travel as a transverse wave?

If we consider sound in air, the air molecules are already moving in random directions. When a vibrating string (for example) makes a sound its vibration gives the molecules a push which will on ...
• 1,882
1 vote

### How can sound travel as a transverse wave?

Mediums with a very low shear modulus, like fluids, do not support transverse wave motion. Transverse motion is defined by the condition $\nabla \cdot \vec{u}=0$ (where $\vec{u}$ is the displacement). ...
• 1,817

### How can sound travel as a transverse wave?

Sound in air is not a transverse wave. Elastic waves in a solid can be transverse or longitudinal, and are sometimes called "sound", but the atoms in a solid are attached to one another by ...
• 54.8k
1 vote

### Do waves really exist?

The problem here is confusing physics with reality. Physics models reality. It aims to produce models which are accurate "enough" for a given purpose. A water wave is a mathematical ...
1 vote

### Do waves really exist?

A mathematical wave is an abstract notion, a mathematical solution to a wave equation. In that sense, "waves" do not exist, because there are no systems that perfectly follow any ...
• 1,817
Accepted

### Can we trust our ears in speech recognition in an audio file?

If you start with an empty project in Logic Pro then nothing can "appear" in the project unless you add it or create it. Everything that is in your project will appear in the track or clip ...
• 56.9k

### Why is transfer of heat very slow as compared to transfer of sound in solids?

Sound propagates as a coherent mechanical wave. If $x$ is the direction of propagation of the wave, all the atoms/molecules with the same $x$ coordinate will oscillate in the same manner, transferring ...
• 16.4k

### Why is transfer of heat very slow as compared to transfer of sound in solids?

You are perfectly right that both heat transfer and sound transfer happen via vibrations of atoms/molecules which bump into each other via the electromagnetical force. However, there is a core ...

### How do shock waves reflect?

A shockwave is just a pressure wave. When it encounters the wall, part of the wave is reflected and part of it is refracted into the wall. The energy of the wave has to go somewhere, and if the atoms ...
• 2,011
1 vote

### Why is transfer of heat very slow as compared to transfer of sound in solids?

Statistics If you apply a large force to one end of your rod, how many different ways can the atoms in the rod respond to the force? Since the force is applied nearly uniformly, the atoms can ...
• 2,622

### Why is transfer of heat very slow as compared to transfer of sound in solids?

Heat and sound are both transferred via vibrations in a material, and both are transferred at the speed of sound. The mistake you are making is that you are comparing the speed of sound (in m/s) with ...
1 vote

### Why is transfer of heat very slow as compared to transfer of sound in solids?

This adds (hopefully) to Prem's answer, which is a clear and good explanation. When "heat" is applied to a thermally conducting rod (high or low or other) heat energy "enters the rod ...
• 1,694

### Why is transfer of heat very slow as compared to transfer of sound in solids?

The Core Explanation is that Sound Energy is not stored , while Heat Energy is stored. When we make Current flow though a wire , the electrons generally do not get stored along the wire , hence the ...
• 530

### Why is transfer of heat very slow as compared to transfer of sound in solids?

If you hit one end of a rod, you push iron atoms at the end. The bonds between atoms are like stiff springs. Pushing an atom compresses the spring and pushes on the next atom. This continues through ...
• 41.8k

### Why is transfer of heat very slow as compared to transfer of sound in solids?

Here is why. In the case of sound propagation, the vibrations of the molecules in the bulk are pointed in the same direction, and hence propagate as a wave at the sonic velocity in the solid. Heat ...
• 96.2k
1 vote
Accepted

### Interpreting the magnitude of vectorial phasors

I am not sure there is a good general geometric interpretation of the vectorial magnitude. If you really want an interpretation that is generally valid, perhaps a better approach would be to ...
• 1,975

### What is the pitch or air flow constant of a whistle?

A whistle that produces sound waves in air is adequately modeled by the ordinary laws of acoustics and does not require consideration of anything occurring at the molecular level. The simplest model ...
• 96.2k

Theo, It is actually electric power input, but not max sound output. Also, 140 dB speaker would be illegal, as you would kill people with sound while aeroplane is about 120 dB. I hope you don't want ...
1 vote

The marking on the speaker is supposed to show maximum input power. As often with technical specifications on items aimed at consumers they can be, well, a bit shady. A smaller speaker with a 3W input ...
• 844

### Is it possible to "pull" sound waves using only an object?

A receiver dialed in to a specific frequency band, and headphones to perceive the initial vibration of the medium that generated said frequency.
1 vote

### What is the difference between loudness, amplitude and volume?

The terms are related, but they are certainly not the same. The peak amplitude of a wave is its maximum displacement away from its equilibrium position. This term can be applied to any type of wave, ...
• 56.9k

### Why two Doppler shifts when reflecting from a moving object?

Where does the "2" in $u=\frac{\Delta f_0}{2f}(c)$ of the answer come from? This factor of 2 is a crude approximation which results from simply halving the one way approximation of \$u=\frac{...
• 6,646