# Question de538

1) conversion between frequency $\nu$ and wavelength $\lambda$ for, say, the spectrum of white ligth (rainbow), using:
$c = \lambda \cdot \nu$
Where $c$ is the speed of light in vacuum (c=3××10^8 m/s)
2) relationship between energy $E$ and frequency $\nu$ of a photon emitted or absorbed by an atom as:
$E = h \cdot \nu$
Where h=6.63××10^(-34) Js# is Planck's constant.