# Tag Info

1

Be careful with the terminology. The emission of light depends from the temperature of the emitting body. The bandwidth goes from infrared to red and blue to ultraviolet than higher the temperature. Red and blue shift means, that the well known spectrum from elements like hydrogen is shifted to the blue or red side. And yes, this happens due to the doppler ...

1

The star emits red light because it has a surface temperature somewhere around 3,500 Kelvin. Our sun has a temperature of about 6,ooo Kelvin so it emits yellow/white light. Like any black body radiation, the temperature determines the frequency of the emitted photons. As for the gravity potion of your question, I may be wrong but I think you talking about ...

0

Here's my addition. Many of the answers above use the erroneous argument that frequency is the determining quantity, on the basis that the same object viewed in different media appears to be the same colour. This is meaningless, since the light has to travel through the vitreous humor (with refractive index 1.33) immediately prior to reaching the retina. ...

2

Building on prior answers, the facts are: Color is determined by the energy of the EM Wave that reaches your eyeball. Energy is defined as $E = hf$, where $h$ is Planck's constant and $f$ is the light's frequency. Thus, the color of an EM Wave is defined by its frequency. In other words, measuring the frequency of an EM Wave is sufficient to identifying the ...

2

Good theoretical answer is that it results from linear acoustical wave equation and its presuppositions. It is therefore good approximation whenever linear acoustics still can describe the wave propagation (that would by e.g. 90% of room acoustics practical examples). Typical examples of problematic models are large-amplitude events (e.g. a shockwave after ...

1

The spectrum of various resonant tube arrangements (half-open, fully-open fully closed) is something that can be measured in a very basic laboratory and gives solid evidence that the claim is true over the kinds of frequencies that are accessible in such a lab. Say a few hundred to a few thousand hertz.

3

It's a bit pat maybe, but if the wavelength-dependence were detectable over human distance scales, the (quality of) sound (not just the volume) of music, speech etc. would depend noticeably on how far one were from the source.

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A more general principle in the quantum framework is the Heisenberg uncertainty relation $$\large{\color{red}{\Delta \mathrm{x}\Delta \mathrm{p}\ge \frac{\hbar}{2} \\ \Delta \mathrm{E}\Delta \mathrm{t}\ge \frac{\hbar}{2} }}$$ It tells us that when the momentum is zero the position is indeterminate, actually it could go from zero to infinity to obey the ...

0

The color of an object is completely determined by the refractive index and the geometry of the object. The reason why it is not obvious is that one has to takes the imaginary part of the refractive index into account. The real part determines the wavelength of light in matter and the imaginary part describes absorption of light in matter. When you ask what ...

-2

the drop presence in atmospheric works as a prism which separated white light into different color a so a rainbow having different colour seems to we . in long reason we can says that when drop or molecules are lies on the path of sunshine they absorbed some light and some reflected which lies on our eyes then a reciprocal image created on retina and by ...

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