Derivation of the frequency of the first harmonic (all A-Level students ought to know this)

[@Jimmy-vg2gd]

Keith hello im a student of RUDN and im glad to see man from another culture who study physic and math. Im also study these both objects + study english . I will be interest to work in another countries in future. Your videos helps me to know which levels of physics have another country thanks.

[@chharlessweeney]

Thanks Keith for the clear derivation ... interesting.