I am sorry, I don't understand this, the radios thing.Ibix said:but nobody else's radios are going to stop working just because you're shaking him around.
In a frame that is accelerating...Slimy0233 said:I mean, it's literally at rest from his perspective.
sorry Dr, but what's your point? please explainDrClaude said:In a frame that is accelerating...
Well, if there's a source of radio waves then radio detectors will be able to detect them. Even if your friend's radio is disabled by circumstance, he can still hear other radios detecting the waves, so he knows they're there. And he can tell he's oscillating using accelerometers, so even assuming that the oscillation disables the radio he can correct for it and make his radio inertial.Slimy0233 said:I am sorry, I don't understand this, the radios thing.
You detect radio waves using the motion of electrons in a wire under the changing electromagnetic field of the wave. If you oscillate the wire I think you will cause the electrons to oscillate along with it, and they will be further accelerated by the electromagnetic field of the wave. So I think you'll still get a response from the receiver.Slimy0233 said:Also, I get a feeling that you are saying he would be able to detect those oscillations? I mean, it's literally at rest from his perspective. So, I was just wondering how?
You seem to be thinking that in the frame where he particle is at rest, since it is at rest and not accelerating, it cannot emit radiation. But that is only true for particles at rest in inertial frames.Slimy0233 said:sorry Dr, but what's your point? please explain
thank you very much for explaining that.DrClaude said:You seem to be thinking that in the frame where he particle is at rest, since it is at rest and not accelerating, it cannot emit radiation. But that is only true for particles at rest in inertial frames.
hey... thank you again! that's very helpful!Ibix said:Well, if there's a source of radio waves then radio detectors will be able to detect them. Even if your friend's radio is disabled by circumstance, he can still hear other radios detecting the waves, so he knows they're there. And he can tell he's oscillating using accelerometers, so even assuming that the oscillation disables the radio he can correct for it and make his radio inertial.
You detect radio waves using the motion of electrons in a wire under the changing electromagnetic field of the wave. If you oscillate the wire I think you will cause the electrons to oscillate along with it, and they will be further accelerated by the electromagnetic field of the wave. So I think you'll still get a response from the receiver.
Remember that your friend can detect whether he is moving inertially or not in an absolute sense. So he can tell whether the charged particle holding position infront of his nose is moving inertially or not. It is, therefore, not at all obvious that he shouldn't expect EM radiation.
Oscillating charged particles create changing electric and magnetic fields, which propagate outward as electromagnetic waves. The oscillation of the charge generates a time-varying electric field, which in turn induces a time-varying magnetic field, and this interplay between the electric and magnetic fields results in the propagation of an electromagnetic wave through space.
The frequency of the oscillating charge directly determines the frequency of the emitted electromagnetic wave. Higher oscillation frequencies result in higher frequency electromagnetic waves, such as visible light or X-rays, while lower frequencies result in radio waves or microwaves. The amplitude of the oscillation affects the intensity or power of the emitted wave; larger amplitudes produce waves with greater energy.
Maxwell's equations are fundamental in describing how electric and magnetic fields are generated and altered by charges and currents. They show that a time-varying electric field creates a magnetic field and vice versa. Specifically, Maxwell's equations predict that oscillating charges produce electromagnetic waves, and they describe the wave's propagation through space at the speed of light.
No, electromagnetic waves cannot be generated without the presence of oscillating charges. The oscillation or acceleration of electric charges is the primary mechanism for creating electromagnetic waves. Even in antennas, which are designed to emit radio waves, the current that oscillates back and forth in the antenna elements is due to the movement of charged particles.
In antennas, an alternating current causes the charges to oscillate back and forth along the antenna elements. This oscillation creates a time-varying electric field around the antenna, which induces a time-varying magnetic field. The interaction of these fields propagates away from the antenna as radio waves. The frequency of the alternating current determines the frequency of the emitted radio waves.