Practice question from chapter text
Derive the minimum reflector distance for a distinct echo if persistence is 0.1 s and v = 340 m s⁻¹.
واضح بازگشت کی تاخیر0.1 s اور v = 340 m s⁻¹ ہو تو کم از کم فاصلہ اخذ کریں۔
Solution & explanation
The sound travels to the reflector and back, so total distance is 2d. With v = 2d/t, rearrange d = vt/2. Substitute d = 340 × 0.1 / 2 = 17 m. The separation is approximate and listener/environment dependent.
Independent study material · English-medium textbook p. 53–54 · Original book ↗