The sensation of sound persisting in our brain for about 0.1 seconds is crucial for hearing distinct echoes because it allows us to distinguish between the original sound and its reflected echo.
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The speed of sound changes with the temperature of the air. As the speed of sound increases with higher temperatures, the minimum distance required for hearing distinct echoes also increases.
The minimum distance required for hearing distinct echoes is calculated by multiplying the speed of sound by the time interval (0.1 seconds) and halving the result. For example, at a speed of 344 m/s, the minimum distance is (344 m/s) ...
To perceive a distinct echo, the time interval between the original sound and its echo must be at least 0.1 seconds.
An echo is the reflection of sound waves off an obstacle, such as a tall building or a mountain, resulting in the same sound being heard again, albeit with a slight delay.