Answer:
1.36x10^15 Hertz
Step-by-step explanation:
The wavelength, λ, and frequency, ν, of light are described by the equation:
c = λν
where c is the speed of light (c = 3.0x10^8 m/s)
We are given the wavelength, λ, as 220nm
We'll need this in meters, not nanometers, nm.
1nm = 10^-9m
(220nm)*(10^-9m/nm) = 2.20x10^-7m
v = c/λ
v = (3.0x10^8 m/s)/(2.20x10^-7m) = 1.36x10^15/s or Hertz (1360 terahertz)