Final answer:
Resonance in physics refers to a system oscillating at its natural frequency and is a mutual phenomenon in systems like musical instruments, not 'contagious.' Dissonance is a psychological concept describing the mental discomfort from conflicting beliefs, not a physical process that spreads among individuals.
Step-by-step explanation:
The statement 'Resonance is contagious, but dissonance is not contagious' seems to be a misinterpretation of the concepts as applied in physics. In physical terms, resonance occurs when a system oscillates at its natural frequency, resulting in the amplification of an external force's effects. This principle of resonance is evident in sound systems, such as musical instruments, where resonant frequencies interact constructively to form standing waves.
Cognitive dissonance, on the other hand, is a psychological concept that refers to the mental conflict that occurs when beliefs or assumptions are contradicted by new information. The grapple with cognitive dissonance can indeed lead to a change in beliefs or attitudes, yet it is more of a personal phenomenon rather than a 'contagious' one. Thus, the initial statement is incorrect in conflating the physical phenomenon of resonance, which can be mutually experienced by systems, with the psychological experience of dissonance, which is an individual internal process.