EM Wave direction and frequency

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Homework Help Overview

The discussion revolves around electromagnetic (EM) waves, specifically focusing on the relationship between the magnetic field (B field) and electric field (E field) frequencies and strengths. The original poster presents a scenario involving an EM wave traveling west with specific characteristics, including frequency and magnetic field strength, and seeks clarification on the corresponding electric field properties.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the frequencies of the electric and magnetic fields, questioning how they are related in the context of EM waves. There is an attempt to derive the wavelength using the wave equation and to confirm the frequency of the electric field.

Discussion Status

Some participants have provided guidance on the relationship between the frequencies of the electric and magnetic fields, suggesting that they are equal. The original poster expresses some confusion regarding the wavelength calculation and the implications for frequency but acknowledges assistance received.

Contextual Notes

There is a mention of the speed of light as a constant in the context of the wave equation, and the original poster appears to be grappling with the implications of this constant on their calculations. The discussion reflects an exploration of fundamental concepts without reaching a definitive conclusion.

physics noob
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hi guys i had a quick question about EM waves

given EM traveling west, B field oscilates vertically and has f= 80,000 Hz and a rms strength of 6.75e-9 T what are the frequency and rms strength of electric field and what direction...


so for direction i have it ocscillating horizontally and for rms strength i have E= cB

so E = 2 v/m but for frequency i have no idea


wavelength * f = v but i have no idea what wavelength is... any help is appreciated thanks!
 
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physics noob said:
hi guys i had a quick question about EM waves

given EM traveling west, B field oscilates vertically and has f= 80,000 Hz and a rms strength of 6.75e-9 T what are the frequency and rms strength of electric field and what direction...


so for direction i have it ocscillating horizontally and for rms strength i have E= cB

so E = 2 v/m but for frequency i have no idea


wavelength * f = v but i have no idea what wavelength is... any help is appreciated thanks!
you correctly solved the first questions
you're very close to the "frequency" answer.
how is the freq of the E field related to the freq of the B field in this EM wave?
(hint: think "equal")

also FYI:
(frequency)*(wavelength) = velocity = c = 3x108 m/sec
since you know that frequency = 80,000 Hz, you can also determine wavelength of this EM wave (altho it's not required for the problem solution)
 
thanks for your help, i got it now, forgot that c=V thanks again
 
actually, I am kinda stuck again,,,,, if i used V=c,,, then i would get a wavelength of 3750m, and then when i try to find frequency of E field, i would get that it has the same frequency of B field, because A=B B=C
A must = C
A being B field frequency and C being E field frequency
 
...i GUESS i can live with it...lol...thanks guys
 

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