To hear a clear echo, the reflecting surface should be at least ________ meters away from the source of sound.
واضح گونج سننے کے لیے، عکاسی کرنے والی سطح کو آواز کے منبع سے کم از کم کتنے میٹر دور ہونا چاہیے؟
Answer: 17 meters
Explanation
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