The change of the direction of a wave-front because of a ...
The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?
refraction
reflection
diffraction
interference
dispersion
Correct answer is A
Refraction: change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.
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The value of F in the figure above when in equilibrium is ...
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