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.

Answer 1

The correct description of the changes in visible light moving from red to violet is:

**The energy increases.**

As you move from red to violet in the visible spectrum, the wavelength decreases, the frequency increases, and therefore the energy of the photons also increases. The speed of light remains constant in a vacuum.

Here's a brief explanation of the other options:

- **The speed decreases**: This is incorrect; the speed of light in a vacuum is constant.
- **The wavelength increases**: This is incorrect; the wavelength decreases as you go from red (which has a longer wavelength) to violet (which has a shorter wavelength).
- **The frequency decreases**: This is incorrect; the frequency increases as you move from red to violet.

So, the main change as you move from red to violet is the increase in energy.