HWK40s_11G - 12. Interference occurs when two or more waves...

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HWK 40 (SOLUTIONS) (due 5/04/07) Read chp. 25 sections 1 through 8 Do: 1, 8, 11, 12, 14 1. a. A wiggle in time is called a vibration. b. A wiggle in time and space is called a wave. 8. The medium through which a wave travels does not move along with the wave itself. A wave carries energy in some direction (called the direction of propagation) indefinitely, or until it hits a boundary and reflects back. The medium vibrates 1. perpendicular to the wave’s direction, for a transverse wave OR 2. parallel to the wave’s direction, for a longitudinal wave. 11. In a transverse wave, the medium vibrates in a direction perpendicular to that of the wave’s propagation. In a longitudinal wave, the medium vibrates in a direction parallel to the wave’s propagation.
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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 barrier, it reects back and interferes with the incident wave. You can think of this eFect 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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