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1 vote

Is possible to "isolate" some audio frequency?

.. is possible to a certain human to hear a spectrum that others can not, No. Human hearing is limited to a frequency range of about 20Hz to 20kHz and that frequency range is determined by the ...
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1 vote

Is possible to "isolate" some audio frequency?

Individual humans can have odd capabilities, but I've don't think what you postulate is known to happen. Humans commonly can hear a range of frequencies that decreases with age (in my youth, I could ...
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2 votes
Accepted

Why is this a negative frequency?

The naming of positive and negative frequency is a convention related to your Fourier transform conventions. In quantum mechanics, a more physical distinction is between positive and negative energy ...
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1 vote

Are photons with different frequency distinguishable?

Let's consider photons in a cubical box (a cavity) with side length $L$. The modes of the electromagnetic field are labeled by: The integers $\{n_x, n_y, n_z\}$, which are related to the wavenumbers $...
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3 votes
Accepted

Can Low-Freq sound wave with High-Amplitude destroys human ear?

If my understanding of the biology is correct, ears are destroyed when the difference of the pressure on the different sides of the eardrum is sufficiently large. If someone were not able to equalize ...
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0 votes

How to change frequency of a millimeter wave?

In general, the frequency of a wave is determined by its source. It can be Doppler shifted by reflection from a moving surface. Other than that you would need to absorb the energy and use that to ...
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0 votes

How can you change the resonant frequency of a solid guitar body?

Solid-body electric guitar does indeed have resonant frequencies. They work through a transduction process generating an electric signal that is later radiated to the air using a loudspeaker. This is ...
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2 votes

How can you change the resonant frequency of a solid guitar body?

Yes, the resonant frequency of a solid guitar body can be changed by adding or removing material but it provides no benefit to the sound that can't be accomplished by less destructive means such as ...
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3 votes

Is there any end to the electromagnetic spectrum?

In theory, the electromagnetic spectrum should extend indefinitely without limit. You can create an electromagnetic wave with arbitrarily long or short wavelength, and therefore arbitrarily low or ...
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0 votes
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What happens to the time period when refraction occurs?

The frequency is the inverse of the period. So since the frequency is the same the period is also the same
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1 vote

How to calculate the overall harmonics of a system of tubes?

Summary: There is not a simple way to obtain the fundamental frequency of the composite tube you are describing in any sort of accurate manner. A more rigorous approach is necessary. Longer ...
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3 votes

Are gamma rays the limit of the frequency photons can attain, and if yes, why?

Which Universal factor imposes this limit of electromagnetic radiation, and what is it called? In the table here for the electromagnetic spectrum the energy of a gamma rays is given in megahertz ...
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2 votes
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Are gamma rays the limit of the frequency photons can attain, and if yes, why?

Gamma rays doesn't impose any frequency limit as per definition, because gamma rays just means electromagnetic waves which have frequency $\gt 10^{18}~\text{Hz}$. Upper frequency limit is imposed by ...
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2 votes

What frequency of cord shaking maintains the same vertical motion for a point on the cord after increasing the wave speed on the cord?

Bottom line intuitive answer: Changing the propagation speed affects the relationship between frequency and wavelength. The wave moves faster, but is correspondingly longer, and those two cancel out,...
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7 votes

What frequency of cord shaking maintains the same vertical motion for a point on the cord after increasing the wave speed on the cord?

It's not specified which point on the cord we are focusing on. That is for good reason: different points behave the same way, just with a different phase offset, which is not relevant to the question. ...
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5 votes
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What frequency of cord shaking maintains the same vertical motion for a point on the cord after increasing the wave speed on the cord?

You already have a nice, brief and concise answer but I'd like to add more to it. From the "fundamental" equation for waves $$c = \lambda f \tag{1}\label{1}$$ where $c$ is the speed of wave ...
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3 votes

What frequency of cord shaking maintains the same vertical motion for a point on the cord after increasing the wave speed on the cord?

Since this is a $y$ vs. $t$ graph, the frequency of the wave can easily be picked out as the (inverse) time between matching parts on the wave (e.g. peak to peak, $0$ to $0$, trough to trough, etc.). ...
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0 votes
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From discrete to continuous superposition of waves, what happens to omega?

The continuity of the function $\omega(k)$ guarantees that $\omega(k_1)$ and $\omega(k_2)$ will be close if $k_1$ and $k_2$ are sufficiently close. Formally, the continuity of $\omega(k)$ at $k_1$ ...
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