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Why is an echo weaker than the original sound? 1. The echo has a shorter wavelength than the original sound due to the reflection. 2. The echo has a smaller amplitude than the original sound because sound spreads and its intensity decreases with distance. 3. The echo has a longer wavelength than the original sound due to the reflection. 4. The echo has a higher frequency than the original sound due to the reflection.

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The echo is weaker than the original sound since the echo has a smaller amplitude than the original sound because sound spreads and its intensity decreases with distance. For example, when the sound from a speaker is heard and is compared to its echo, the echo heard has a lower amplitude than the actual sound. 

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