In the wave concept of electromagnetic radiation, velocity refers to which of the following?

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Multiple Choice

In the wave concept of electromagnetic radiation, velocity refers to which of the following?

Velocity is the rate at which the wave propagates through space—the speed of the wave fronts as the electromagnetic field travels. This is what we mean by the wave’s speed: how fast the disturbance moves from one point to another. It isn’t determined by how tall the wave is (amplitude) or by how much energy a photon carries (E = hf). It also isn’t the wavelength itself, though the wavelength and frequency together determine how fast the wave appears to travel in a given context. In vacuum, all electromagnetic waves move at the same speed, the speed of light c. If a wave slows down in a medium, its speed becomes v = c/n, where n is the medium’s refractive index. The frequency remains fixed while the wavelength changes to λ' = v/f. So velocity specifically refers to how fast the wave propagates, not its amplitude, energy, or wavelength.

Velocity is the rate at which the wave propagates through space—the speed of the wave fronts as the electromagnetic field travels. This is what we mean by the wave’s speed: how fast the disturbance moves from one point to another. It isn’t determined by how tall the wave is (amplitude) or by how much energy a photon carries (E = hf). It also isn’t the wavelength itself, though the wavelength and frequency together determine how fast the wave appears to travel in a given context.

In vacuum, all electromagnetic waves move at the same speed, the speed of light c. If a wave slows down in a medium, its speed becomes v = c/n, where n is the medium’s refractive index. The frequency remains fixed while the wavelength changes to λ' = v/f. So velocity specifically refers to how fast the wave propagates, not its amplitude, energy, or wavelength.

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