Not the Speed of Fright
Relax! You don’t need
to memorize these
wavelengths; they’ll be
provided for you on test
day. You do, however,
need to remember the
speed of light.- What’s the approximate frequency range for orange light?
Here’s How to Crack It
According to the spectrum, light is orange if its wavelength is between about 6 ×
10 −7 m and 6.25 × 10−7 m. Using the equation λf = c, we find that the upper end of
this wavelength range corresponds to a frequency of
while the lower end corresponds to
So the frequency range for orange light is
4.8 × 10^14 Hz ≤ forange ≤ 5 × 10^14 Hz