Calculating for delta of frequency

[Ingrid 14A_2E]

Because there are various variations to the formula which one is the most optimal in calculating delta of frequency?

[Claude Chung 2F]

honestly for me the best way to calculate delta frequency is by using this formula: Δν = ν_final - ν_initial. but i think it mostly depends on what information is given in whatever question you're trying to solve

[Aminta Chem]

There are different variations simply because each problem will have different information. So based on the information the problems give you, you will simply use the respective equation that gets you closer to your desired solution. Good luck.