Questions tagged [frequency]
Frequency is the rate of repetitive aspect in the amplitude over a given dimension.
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Is it physically relevant to restrict the solution of a nonlinear PDE to positive frequencies in the Fourier transfrom?
I would like to mention that I am a mathematician and not a physicist, so I apologize in advance if my question seems obvious.
Considering any linear PDE, it is common to understand the behavior of ...
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"Synchronization" Probability of Multiple Waves with Varying Frequencies
Update 1: I've done some digging and I think this is related to signal coherence, namely, that I'm seeing a coherence time of ~3 σ, which is consistent with the definition where Ct=1/Δv where Δv is ...
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Audible frequency of an air vent increases with distance: what's going on?
I was just standing near a loud air vent that was roughly at eye level and pointing downward. I noticed something strange about the noise it was making. The further away from the vent I stood, the ...
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How do I calculate the resonance frequency of a block of material?
I would like to know how I go about calculating the resonance frequency for an object, given its material properties and dimensions.
For example, a small rectangle $X$ by $Y$ by $Z$ dimensions, I ...
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Is there an explanation for this unexpected similarity between binomial coefficients and waves?
Background
Binomial coefficients appeal mostly in probability, combinatorics number theory etc so we were surprised when we observed something that appeared to belong more to physics than pure ...
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Why do water surfaces have persistent "average wavelength" patches?
Have you ever stood above a river or lake and noticed that the surface has visible "patches"? It looks like the surface has different average wavelengths in some areas, leading to the light ...
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Relationship between resonance frequency of a cup and amount of water filled
For a science project I chose to investigate the relationship between the resonance frequency of cups and the amount of water filled in it. I filled the cup with 10 grams of water each time, and used ...
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Resolution of two frequencies
If I am trying to resolve two features in frequency space, with central frequencies A and B and a 'spread' (standard deviation, FWHM etc.) of $\sigma_A$ and $\sigma_B$ what is the spectral separation $...
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Chladni Plate Mathematics
I am a high school student doing an IB Extended Essay investigation concerning the resonant frequencies of Chladni plates of differing materials and sizes. Would someone please explain the definition ...
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Frequence vs speed of a moving object
Imagine swinging wood stick using hand (say it's a 1-meter long cylinder with 2 centimeter diameter, just for the sake of argument). When doing it fast (angular velocity = $\omega_1$), it will create ...
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How do lower frequencies change differently than higher ones as they travel?
I read the following on the internet:
"This means that as sound travels, its relative frequency content alters making the low frequencies more prominent at greater distances, creating low ...
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Why do you feel ripples by sliding finger on an AC-powered macbook surface?
It doesn't have to be a MacBook exactly, other switched power supply powered metal case devices are good enough, but MacBook is the most common.
It must be AC powered; the effect disappears when ...
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Does the formula $E = hf$ apply to all electromagnetic waves?
The formula $E=hf$ shows the energy contained in one photon. Here, we use the simple half wave dipole antenna to evaluate the energy of photons at different frequencies. Surprisingly that gives a ...
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Would slowing down a beam of light change its wavelength and frequency?
I confess that I have little knowledge of physics, so this kind of thing really often goes over my head. However, I did read somewhere that the speed of a beam of light is the product of its ...
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Frequency dependence of Schwinger limit
Schwinger estimated a field of $10^{18}$ volts per meter as a point of "vacuum breakdown", over which spontaneous generation of positron-electron pairs becomes energetically favourable.
But ...
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