Answer:
ν = 5.53 x 10⁶ Hz
Explanation:
The frequency of a radiation, ν ,is inversely propotional to its wavelength, and is given by:
ν = c/λ where
ν = frequency
c: speed of light, 3 x 10⁸ m/s
λ: wavelength in m
Think of frequency as the number of waves per second.
We can directly compute the answer by first converting the wavelength to m for unit consistency and then plugging the values.
1 m = 10⁹ nm
543 nm x ( 1 m / 10⁹ nm ) = 5.43 x 10⁻⁷ m
ν = c/λ = 3 x 10⁸ m/s / 5.43 x 10⁻⁷ m = 5.53x 10¹⁴ s⁻¹
In the metric system the unit s⁻¹ is called Hertz.
ν = 5.53 x 10¹⁴ Hz
