What is the Relationship Between Electromagnetic Amplitude and Power?

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In summary, the conversation discusses how to determine the amplitude of an electromagnetic wave, specifically in terms of joules, length, and frequency. The speaker explains that the square of the amplitude is proportional to the power per unit area and can be measured through irradiance. The easiest way to determine the amplitude is by measuring the power or irradiance and assuming the wave is monochromatic and infinite.
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shintashi
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Hi, I have a question about electromagnetic amplitudes. we can easily find the wavelength of any EM, but how do we determine its amplitude? in terms of joules vs. length vs. frequency?
 
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I don't understand your question. How do you measure amplitude? or how do you calculate it given something else?
 
  • #3
The square of the amplitude [of the electric field carried by the wave] is proportional to the irradience (intensity) of the wave, which is the power per unit area and hence has SI units of watts per square meter (W.m-2)
 
  • #4
The easiest way is to measure the power or irradiance and infer the amplitude from there, assuming of course that the wave is monochromatic, infinite etc. etc.

Claude.
 

What is EM amplitude?

EM amplitude refers to the maximum displacement or strength of an electromagnetic wave. It represents the height of the wave's oscillations and is measured in units of amplitude, such as volts or meters.

How is EM amplitude related to frequency?

The amplitude of an electromagnetic wave is directly proportional to its frequency. This means that as the frequency increases, the amplitude also increases and vice versa. This relationship is described by the equation A = kF, where A is the amplitude, k is a constant, and F is the frequency.

What factors affect EM amplitude?

The amplitude of an electromagnetic wave can be affected by several factors, including the source of the wave, the distance it travels, and the medium it travels through. Other factors, such as interference and absorption, can also impact the amplitude of a wave.

How is EM amplitude measured?

EM amplitude is usually measured using instruments such as oscilloscopes or signal generators. These devices can measure the peak amplitude of a wave or the amplitude of a particular frequency component within the wave.

Why is EM amplitude important?

EM amplitude is an important characteristic of electromagnetic waves because it determines the intensity and strength of the wave. It can affect how the wave interacts with matter and can also impact the transmission and reception of signals in communication systems.

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