Which of these periodic motions are simple harmonic ?

A. A child swinging on a playground
B. A record rotating on a turntable
C. An oscillating clock pendulum
D. None of the above

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.