Amplitude
Frequency (Hz)
200 250 300 350 400 450 500 550 600 650 700
A
B
Figure 18.4
Two examples of resonance: (a) resonance of a wine glass at its natural frequency f 0 = 454.73 Hz, plotting the
amplitude of the glass's motion versus the frequency of the sound exciting it ( ♪ sound example 18.2); (b) reso-
nance showing the detection by the ATLAS collaboration at CERN of Z neutral intermediate bosons (mass 90
GeV) by their decay into an electron-positron pair, plotting the number of detected events versus the invariant
mass-energy of the observed electron-positron pair.