Why an open tube at both ends suffers resonance when subjected to a sound that propagates through the air with length of where $L / 2$?  I already know the methodology to calculate the harmonics in an open tube.  So, I'm not expecting an answer that is based on the calculations. I want to know why this phenomenon occurs from the molecular point of view of the air, taking into account that air could be considered as an ideal gas whose molecules have no interaction with each other.
38039
How can standing waves be produced in an open organ pipe even though both of its ends are open? Can someone explain with more clarity?
103842
Given that space is not a perfect vacuum, what is the speed of sound therein? Google was not very helpful in this regard, as the only answer I found was $300\,{\rm km}\,{\rm s}^{-1}$, from , which is not a source I'd be willing to cite.
2471
So I asked my science teacher how wind could feel colder than normal air when the particles would be moving faster than normal air particles, meaning that they would have more kinetic energy and a higher temperature. My teacher told me that the faster rate of particles hitting your body would mean that the heat would leave faster than in normal air, but I was confused as to why they would take energy.   Eventually, I figured out that the air particles have kinetic energy separate from their velocity and my teacher confirmed this. He also confirmed that the particles would vibrate in place while they are moving.  How is this possible, and how does the vibration dictate the heat transferred, and not the velocity?
48934
So, if we have a large pipe which is constricted in the middle, the fluid in the middle section  will move faster. Why is it so? What dictates that liquid that an X amount of it must pass on the other side regardless of the size of the encasement?  The only reason I could think about is because that the initial pressure which causes the movement somehow is being transferred to a smaller area, but that makes no sense.
14420
I was wondering how it is possible for overtones to co-exist at the same time. When one pulls a string, it starts to oscillate and forms a standing wave with frequency $$f_0 = f$$ Additionally, infinite overtones oscillate at integer multiples of the fundamental frequeny:$$f_n = (n + 1) * f$$ with n being the nth overtone. Since all overtones are essentially standing waves too and standing waves are formed due to reflection and interference, wouldn't the existence of multiple overtones disturb the wave?   And not only overtones but any disturbance like interfering waves from the environment, wouldn't they hinder the creating of standing waves? And lastly (from a physical standpoint) why has the fundamental frequency the greatest amplitude?
93318
Last day , when i was working on two interconnected balloons , a question was kicking my brains !!! This is the explanation of the question:  First , suppose a system that composed of two spherical membranes filled with air (two balloons have different initial volumes {means that the pressure inside which balloons are different} and the air pressure is 1 a.t.m) . We connect them with hollow tube and a valve. When we open the valve , one of them shrinks and the other one expands (It depends on their pressure) .  So how can we get the velocity of the flowing air between two balloons? (Consider everything but if you have reasons for not considering one of them -for example the ratio of friction in the tube- Don't consider them and just tell me the reason)  Thanks
99080
Can someone explain why a longitude wave can pass through the liquid, but a transverse wave can't. And can someone recommend some good animation of these processes.
42337
A sound wave is essentially air particles oscillating parallel to the direction of travel of the wave.  We learnt that $v = f\lambda$, where $v$ is the speed of the wave, $f$ is the frequency of the wave and $\lambda$ is the wavelength of the wave.  Suppose the air particles oscillate with a frequency of $f_{particle}$. Is there any relationship between $f_{particle}$ and $v, f, \lambda$ of the entire sound wave?   I thought about this because intuitively, if the air particles vibrated faster, then the wave should travel faster, but I am unable to come up with any formula that describe this relationship (if it is even true!).
31482
So, in typing the title of this question I was recommended , which confirmed my guess that this effect "propagates" at the speed of sound (though I just had a feeling, I don't really understand why).  I also only have high-school level physics experience.  I feel like I don't know physics well enough to really know what to ask correctly, but I'll try to explain.  So, I rotate my arm, and, even though tendons are just pulling it at a certain location, the rest of it follows suit.  Why is that?  What is happening at an atomic/molecular scale that ends up "conveying forces" over a distance?  And, something else I don't understand- what is so special about the speed of sound that makes it this "fundamental unit of translation", or something?  Maybe the better question is "what processes at an atomic/molecular scale lead to the speed of sound being associated with all of these behaviors", which ties both questions together.
33601
This is related to another question I just asked, but they are different enough I thought it deserved its own spot. Speaker elements seem to always be shaped like a cone with a portion of a sphere at the center. What is the physics reasoning behind this shape being so standard? Is it a precise shape that all speaker elements share (e.g. parabaloid + sphere), or just kind of a general shape that "works well"? Does it work just as well for any light solid, or is it actually tuned to the speed at which sound propogates through the speaker element?
97228
At what pressure will be particles in a medium be unable to form a sound wave when disturbed? How can this pressure be described mathematically?  My guess is that this would correspond to the point at which the restoring force due to pressure is unable to create a transverse wave and the disturbed particles travel infinitely far away before the hypothetical wave reaches it's amplitude. But I have no idea how you would even begin to start finding a quantitative value for this point.
31900
Alternatively, why does the force created by blowing out air feel so much stronger than the force created by sucking in air?  Ok, so forget the human factor involved in blowing out candles. Consider a vacuum cleaner with a suction end and a blower end. Anyone who has tried it out notices the blower end creates a much stronger force than the suction end, despite the discharge being (more or less) equal at both ends.  Why does this happen?
44038
I've read that light travels in a straight line and has a wavelength of 400nm to 700nm. But I don't understand why does it have a wavelength and what creates its wavelength? I agree with the concept of sound which also has wavelength, thus called sound waves which are created by the vibrational movement in air. I'm not aware of calling light a wave. Does the light vibrate too? If so, then how?
72164
When you're driving and you open 1 car window, say the front one, there comes a horrible noise, but when you open another window just the slightest bit, this noise goes away (I'm sure most people know what I'm talking about then I mention this 'noise').   Why does this noise occur? Why does it go away when another window is slightly opened?   (Not sure about the tag).
16819
I noticed that when I had a helium filled, latex balloon inside of my car, it moved forward in the cabin as I accelerated forward. The faster I accelerated forward, the faster the balloon went from the back of the car to the front of the car. The balloon didn't have a string.  This became a game with my 4 year old as we drove home. We figured out where the balloon would go based on how fast I accelerated, turned corners etc.  I expected that it would act a lot like the water in a cup does, but it was the total opposite it seemed.  What forces caused this behavior?  I assumed it has something to do with the fluid dynamics in the closed cabin, but I can't figure it out.
79553
is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. My question is what is the fundamental reason for this refraction?is it something related to the atomic force?
84607
Is there any reason for why a small speaker cone cannot produce low end sound at a comparable volume to higher frequencies?  I can understand how a larger speaker would be in contact with more air and so would produce a louder sound, but why specifically is this important for the low end?  As an aside, I think this phenomenon can also be seen elsewhere, such as the size increase of the violin family (violin: small/high pitched, double bass: enormous/low pitched). If you tuned the strings of a violin to double bass pitch I doubt you’d hear much!