JAMB - Physics (1998 - No. 26)
In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is
70Hz
840Hz
1120Hz
1960Hz
Explication
F3 = 7Fo
= 7 x 280
= 1960Hz
= 7 x 280
= 1960Hz