Quiz frequency wavelength

Spectrum and wavelength domains

When it receives light, the human eye translates certain wavelengths into colors.

Click on Spectrum. This bar shows a range of colors from violet to red, and their corresponding wavelengths.

The white vertical indicator on the spectrum bar indicates the wavelength emitted by the oscillating charge.

Click Play. Gradually increase the frequency (slider at bottom right) and observe how the wavelength indicator moves across the spectrum.

- Which wavelength is red?

To find out, press Pause when the indicator is on red. Then use the grid, with each square measuring 100 nm ($1\mathrm{nm}=10^{-9}\mathrm{m}$) .

You can also use the Measurement arrow: place the mouse pointer over it (it turns into a hand) to move the measurement arrow to a bump on the wave, then enlarge the measurement arrow using the - / + buttons.