The lecture Periodic Motion Example by Jared Rovny, PhD is from the course Periodic Motion.
Light is a wave that moves at a speed of c = 3 x 10⁸ m/s. If the wavelength of a light wave is 600 nm, what is its frequency?
If a light wave has a frequency of 30 THz, what is its wavelength? Note: Speed of light is c = 3 x 10⁸ m/s.
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The lecture itself is good. His pace is slow enough to follow, yet not too slow, and he is extremely clear. Including questions in later lectures would be a great improvement to the course.