The value of sin ( x ) tan ( x ) is equal to what?

Wavelength:
Both the frequency and the wavelength decrease as the $E=hf$, where $h$ is constant (Planck's constant), so does the energy carried by the waves.Waves with a short wavelength have the most energy. Red waves have a relatively long wavelength (around $700\mathrm{nm}$), whereas violet waves have a much shorter wavelength (roughly half that).Due to their short wavelength and high frequency in the visible light spectrum, violet waves have the highest energy.