# Questions tagged [frequency]

Frequency is the rate of repetitive aspect in the amplitude over a given dimension.

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### Changing frequency of light without changing its energy

Three observations were detected in the photo-electric effect: The kinetic energy of the ejected electrons doesn't change if you change the intensity of light (instead more electrons are ejected with ...
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### Frequency of the photon in general relativity

There is an observer at ($r,\theta, \phi$) outside of the Schwarzschild blackhole. A beacon is falling into the black hole along $r$ coordinates of the metric and is emitting radiation. At $r_{em}$, ...
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### Why do directional microphones have a high bass response at short distances?

In the audio field, it is taken as a given that directional microphones have a higher response at lower frequencies when the source is close to the microphone. Many directional microphones have a ...
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### The light behavior from vacuum to glass [duplicate]

What does the statement labelled mean? This is in Feynman's lectures on physics. Why should the frequency in both vacuum and glass be same? What is the meaning, that charge sitting on the boundary ...
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### Does colour of light depend on intensity of light? [closed]

By intensity I mean frequency of light
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### Physical Significance of Frequency of matter waves

So, in our book there was an additional exercise part and this question baffles me:- Q. Answer the following questions:- The energy and momentum of an electron are related to the frequency and ...
1 vote
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### What determines the particular frequency of infrared any given object emits?

Infrared (IR) includes EM waves between 780nm and 1mm in wavelength. (Source) As an object gets hotter, it emits a greater amplitude of infrared. What determines the particular frequency(s) of IR an ...
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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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### FFT plot not aligning with lower natural frequencies

I have a cantilever beam with gapped springs on top and bottom and an impulse is given at the free end initially. I modelled it using finite element method with 30 elements. The beam then oscillates ...
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### Why does high frequency have high energy?

The electromagnetic spectrum's wavelengths all travel at the same speed, $c$. Also, the wavelength $\lambda$ and frequency $\nu$ are related by $c = \lambda \cdot \nu$. Since all moving particles here ...
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### Do all objects at the same temperature glow the same color?

Does Kirchhoff's law for heat radiation imply that all objects at the same temperature will glow the same color? In other words, if a piece of molten iron glows the same color as my body, which ...
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### Pound-Rebka Experiment

I am new here and have a question. Does anyone know if the velocity of the photons changes in the Pound-Rebka experiment? Do the wavelength and the frequency change simultaneously, so that there is no ...
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### Why does the amplitude decrease due to friction in forced vibrations?

Basically, in forced vibrations the frequency of the external force is acquired by the body when both the natural frequency and external frequency is different (won't go into that too because I'll get ...
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### What is the oscillation frequency of the observed/measured free induction decay signal in MRI?

I recognize that many articles attempting to describe the basics of MRI under simplify a lot of technical details. I would like to confirm the following understanding about the free induction decay ...
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### How much frequency is needed to make a tennis ball levitate, using only sound? [closed]

I am planning to make a device that will catch a tennis ball using sound waves to slow down its motion, and make it levitate. But how strong should the sound waves be? Please tell me if there are ...
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### Multiple Pendulums and Resonance

Set up with multiple pendulums suspended from a connecting string. Pendulums 1 and 4 have the same lengths and hence, the same natural frequencies. Others(pendulums 2, 3 and 5) are of varying ...
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### Can cyclotron/gyromagnetic resonance occur if the peak of an AC wave corresponds with the resonance frequency?

So basically I'm curious if it's possible for cyclotron resonance to occur with a non-static, AC magnetic field if the frequency of it is equal to the cyclotron resonance frequency at the peak AC ...
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### Does higher Hertz mean a higher electric bill?

Suppose my electric utility is meant to provide power at 60 hertz, but instead it provides it at 61 hertz. Would my electric bill be higher? Assume I run the same appliances for the same amount of ...
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I encountered this curve in the notes for a physics experiment: It was described by the equation $$A = \frac{kA_0}{m\sqrt{\left(\omega_0^2 - \omega^2\right)^2+(2\gamma\omega)^2}}$$ EDIT: I think it ...