Physics
Waves on a string
Travelling and standing waves, reflections, harmonics.
What happens
A string you can pluck like an instrument: pulses run to the fixed ends, flip on reflection and cross each other unharmed. Drive it near a natural frequency and a standing wave swells up, its harmonics selected by the mode buttons. The probe chart records what a pickup at one point would hear.
Equations used in the module
Equations y_tt = (T/μ)y_xx; v = √(T/μ) y(0)=y(L)=0: f_n = nv/(2L) y(0)=0, y_x(L)=0: f_n = (n−½)v/(2L) n = 1,2,3,...
