Slide 12 What is an echo? Thinking back to interference of waves, what interference causes echos? Slide 13-15 The doppler Effect Sounds moving toward a person- Sounds moving away from a person-
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An echo is the reflection of sound that arrives at the listener some time after the original sound. This phenomenon occurs due to the interference of sound waves, particularly constructive and destructive interference, which can create distinct echoes, especially in spaces with hard surfaces that bounce sound waves effectively, like canyons or empty buildings. The Doppler Effect refers to the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. When a sound source moves toward a listener, the sound waves compress, resulting in a higher pitch. Conversely, as the source moves away, the waves stretch, producing a lower pitch. This is why you hear the familiar sound of a passing siren change from high to low!
