Question

Determine the frequency of light whose wavelength is 4.257 x 10-7 cm

Answer 1

$v = f (wavelength)$i don't know what symbol ya'll use for wavelength so i just put the word instead.We use the greek symbol lambda.So just plug in everything you know.
wavelength=4.257×10^-7x10^-2 and
v=speed of light = 3×10^8
So you should get f= 7.04 ×10^15Hz