To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of 17 meters. This distance ensures that the time delay between the original sound and its reflected sound is perceptible to the listener, creating a distinct echo effect. Shorter distances may not provide sufficient time for the echo to be distinguished from the original sound.
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To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of [B] 17 meters. This distance allows for a distinct time delay between the emission of sound and the reflection off a surface, making the echo audible to the listener.
When the sound travels to a surface and back within a short distance, the reflected sound arrives too quickly to be perceived as an echo. As the distance increases, the time gap between the original sound and its reflection grows, resulting in a more noticeable echo.
Understanding this minimum distance helps in designing spaces for acoustic effects, such as concert halls and outdoor environments, where echoes can enhance or detract from the quality of sound. Therefore, the correct answer for hearing a clear echo is [B] 17 meters.