Answer:
Speed is distance over time, so v = λ / T. The frequency, f, is 1/T, so the equation relating wave speed, frequency, and wavelength is v = f λ .
Explanation:
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C) Some of the light's energy is absorbed by the wall, and some of the light is reflected in different directions
The force of gravity is causing him to accelerate downwards, and the force of friction pulls him back. There’s also a normal force keeping him on the slide.