How can I calculate the amplitude of a wave using frequency and energy?

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Discussion Overview

The discussion revolves around the possibility of calculating the amplitude of a wave given its frequency and energy. Participants explore the relationship between these variables and seek clarification on the wave equation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether it is possible to calculate amplitude from frequency and energy, suggesting they can derive wavelength from frequency.
  • Another participant provides a wave equation and seeks clarification on its components, specifically asking about amplitude (A), phase angle (t), initial phase (k), and amplitude offset (b).
  • Some participants assert that amplitude is independent of frequency and that additional information is necessary to determine it.
  • It is mentioned that energy is related to frequency, but amplitude is connected to energy through transmission impedance, not directly by frequency.
  • One participant notes that the energy in a wave is proportional to the integral of the square of the amplitude over half a cycle, indicating that the relationship involves specific constants depending on the wave type.

Areas of Agreement / Disagreement

Participants generally agree that more information is needed to calculate amplitude, but there is no consensus on the relationship between amplitude, frequency, and energy.

Contextual Notes

Participants express uncertainty regarding the necessary conditions and definitions for calculating amplitude, as well as the implications of the wave equation components.

Butterfly_grl
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I don't know if it's possible or not but I want to calculate the amplitude of a certain frequency. I Have the value of the frequency, the energy needed to give this frequency and say I can calculate the wavelength from the given frequency... So Is it possible to calculate the amplitude?

Another thing could anyone please explain this simple wave equation for me and tell me how can I calculate the Amplitude (A) from it.

x=A sin(t - k) + b

What is t, k and b ( I found this equation on wikipedia)

Thanks
 
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Is this a homework problem? It would be helpful to see how the problem is worded.

In your equation, A is the amplitude, t is a phase angle, k is an initial phase, and b is an amplitude offset.

A more commonly used form is
[tex]x(t)=Asin(2\pi ft+\phi)+b[/tex]
where t now is time, f is frequency and [tex]\phi_0[/tex] is the phase offset. These equations describe oscillatory motion.
 
marcusl said:
Is this a homework problem? It would be helpful to see how the problem is worded.

In your equation, A is the amplitude, t is a phase angle, k is an initial phase, and b is an amplitude offset.

A more commonly used form is
[tex]x(t)=Asin(2\pi ft+\phi)+b[/tex]
where t now is time, f is frequency and [tex]\phi_0[/tex] is the phase offset. These equations describe oscillatory motion.

Well Unfortunately I'm working solo - On my own - It's not a homework
I just want a way to calculate the amplitude of the frequency
 
Well, amplitude is independent frequency. You need more information.
 
As marcus said you need more information to calculate the amplitude.

Yes the energy of the signal is related to the frequency.

The amplitude is related to the energy by transmission impedance, not by the frequency.

The actual energy in a wave is proportional to the integral of the square of the amplitude over half a cycle. The actual constants depending upon the type of wave.
 

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