Which of the following is not an electromagnetic wave a) gamma ray b) light ray c) x-ray d) cathode ray
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CATHODE RAY
A so-called cathode ray is really just a beam of electrons that have been accelerated by a large differential voltage. Basically the defining property of electromagnetic waves/radiation is that in a vacuum they travel at c,c, the “speed of light.” Electrons, having nonzero rest mass, cannot under any circumstances travel at c,c, so they cannot be regarded as electromagnetic radiation.
A so-called cathode ray is really just a beam of electrons that have been accelerated by a large differential voltage. Basically the defining property of electromagnetic waves/radiation is that in a vacuum they travel at c,c, the “speed of light.” Electrons, having nonzero rest mass, cannot under any circumstances travel at c,c, so they cannot be regarded as electromagnetic radiation.
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