Question

which describes the changes in visible light moving from red to violet? the energy increases. the speed decreases. the wavelength increases. the frequency decreases.

Explanation:

The energy of a photon of light is given by $E = h
u$, where $h$ is Planck's constant and $
u$ is the frequency. In the visible - light spectrum, red light has a lower frequency and violet light has a higher frequency. As frequency increases from red to violet, energy increases according to the formula. Also, the speed of light in a vacuum is constant ($c = \lambda
u$), so the speed does not change. Wavelength $\lambda$ and frequency $
u$ are inversely related ($c=\lambda
u$), so as frequency increases from red to violet, wavelength decreases.

Answer:

The energy increases.