EM wave question...

[demayette]

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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 amplitude of the wave.
IV. increase the speed of the wave.

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

The answer is "A". I think it should be "C". Why is it not "C"?

 

[loveoforganic]

Electromagnetic waves in a vacuum move with constant speed.

 

[demayette]

Electromagnetic waves in a vacuum move with constant speed.

Thanks....thats explain it. However, it if EM waves in a vacuum move in constant speed, why they say increase the speed of the wave anyway...It is misleading

 

[loveoforganic]

That was probably their goal 😛

 

[Akarat]

Don't forget that in a vacuum, the speed of light, c = 3.0 x 10^8 m/s. Therefore, you can't increase the speed of the wave because nothing can go faster than the speed of light.

 

[demayette]

Don't forget that in a vacuum, the speed of light, c = 3.0 x 10^8 m/s. Therefore, you can't increase the speed of the wave because nothing can go faster than the speed of light.

That is true...thanks