Electromagnetic wave

[Temperature101]

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To increase the oscillation frequency of an electron (isolated in a vacuum) that oscillates because it is stimulated by an electromagnetic wave, one must:

I. decrease the wavelength of the wave
II. increase the electric field amplitude of the wave
III. increase the magnetic field of the wave
IV. increase the speed of the wave

A. I only
B. II or III
C. I and IV
D. None of the above


BR says the answer is A...Why not C?

 

[MedPR]

The speed of a wave is constant in a vacuum.

 

[theseeker4]

The speed of a wave is constant in a vacuum.

This. You CAN'T increase the speed of the wave.

 

[Temperature101]

Thanks

 

[SaintJude]

If this were not in a vacuum, would the answer be all of the above?

 

[chiddler]

If this were not in a vacuum, would the answer be all of the above?

II s incorrect because more Efield would just make the amplitude bigger but not change frequency.

can somebody explain why III is wrong? I think it also just changes the intensity of the wave since Bfield and Efield are inversely proportional but does not change frequency.

 

[SaintJude]

II s incorrect because more Efield would just make the amplitude bigger but not change frequency.

can somebody explain why III is wrong? I think it also just changes the intensity of the wave since Bfield and Efield are inversely proportional but does not change frequency.

edit : nvm. You'r saying that the amplitude has nothing to do with the frequency. I see.