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it changes in velocity
The speed at which a wave passes through water or other medium is called phase velocity.
It will be like it was before
When light passes through a second medium with different refractive index as the first medium, its velocity will decrease or increase depending on its wavelength and the difference in refractive index of the two media. This causes the 'bending' of light as each of its components try to travel through the second medium at different velocities.
The speed is, and, as a direct consequence, the wavelength.
The maximum distance the particles move away from their rest positions as a wave passes through a medium is the amplitude of the wave.
A wave can only pass through a medium
what happens to interstellear gas as it passes through a spiral density wave
it changes in velocity
The speed at which a wave passes through water or other medium is called phase velocity.
It will be like it was before
The answer depends on what on earth you mean by the "dirtier" of a wave.
When a wave passes through a substance, it gets transmitted through it. The speed of the wave changes depending on the nature of the substance.
the waves energy passes from particle to particle
When light passes through a second medium with different refractive index as the first medium, its velocity will decrease or increase depending on its wavelength and the difference in refractive index of the two media. This causes the 'bending' of light as each of its components try to travel through the second medium at different velocities.
The speed is, and, as a direct consequence, the wavelength.
No. If it happens that the disturbance propagates through the medium, i.e. spreads out from the disturbed point, then the phenomenon that travels away from the disturbance and through the medium describes the wave.