Answer:
a. 3.8 x 10¹⁴ s⁻¹
Explanation:
For the first line,
we have wavelength = λ = 7.9 x 10⁻⁷ m
We know that , speed of light , c is given by:
c = λ x ν
Where λ is wavelength of the line and ν is the frequency
So , the frequency , ν = c / λ = 3 x 10⁸ / 7.9 x 10⁻⁷ = 3.79 x 10¹⁴ s⁻¹
≈ 3.8 x 10¹⁴ s⁻¹
Therefore the frequency is 3.8 x 10¹⁴ s⁻¹ .
