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Unformatted text preview: 12. Interference occurs when two or more waves combine to form a net wave. If the waves interfere constructively, their crests combine and their troughs combine to form a net wave of higher amplitude. If the waves interfere destructively, crests of one wave combine with troughs of another wave to form a net wave with lower amplitude. 14. When a wave (called an incident wave) hits a hard barrier, it re-ects back and interferes with the incident wave. You can think of as self-interference. At certain frequencies, stationary positions of zero amplitude (nodes) form. The positions of these nodes do not change with time. 1...
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- Spring '08