Question

jin has four colorful glass bottles on his windowsill. one is red, one is violet, one is green, and one is yellow. the light that passes through which bottle has the lowest frequency? red violet green yellow

Explanation:

In the visible - light spectrum, red light has the longest wavelength. According to the relationship $c = \lambda
u$ (where $c$ is the speed of light, $\lambda$ is wavelength, and $
u$ is frequency), when the speed of light is constant, the longer the wavelength, the lower the frequency. So red light has the lowest frequency among red, violet, green, and yellow light.

Answer:

red