For a system fixed at both ends (Fixed-Fixed), what condition must the length $L$ satisfy to establish a standing wave?

Answer

L must perfectly accommodate an integer number of half-wavelengths

In a fixed-fixed system, both ends must be nodes. This constraint requires the total length $L$ to fit $n$ segments, where each segment is exactly half a wavelength ($\lambda_n = 2L/n$).

For a system fixed at both ends (Fixed-Fixed), what condition must the length $L$ satisfy to establish a standing wave?
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