What resolving power is needed to resolve spectral lines at 651.22 nm and 651.81 nm?
A)1100
B)1000
C)1200
D)1400
E)1300

Question

Quizplus · Accepted Answer

The resolving power R is given by R = λ/Δλ, where λ is the average wavelength and Δλ is the difference between the wavelengths. Here, λ = (651.22 + 651.81)/2 = 651.515 nm and Δλ = 651.81 - 651.22 = 0.59 nm. Thus, R = 651.515 / 0.59 ≈ 1104, which is closest to 1100.

What Resolving Power Is Needed to Resolve Spectral Lines at 651.22