Sheldon and Joey at a Joey doesn’t share food shirt, hoodie, sweater and v-neck t-shirt, where Sheldon is dressed as doppler's effect and Joey as Chandler. I have to explain you now. When the source of the waves is moving toward the observer, each successive wave crest is emitted from a position closer to the observer than the previous wave. Therefore, each wave takes slightly less time to reach the observer than the previous wave.
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