The distance to the sound-reflecting obstacle is 68m. How long will it take for a person to hear it echo. The speed of sound in the air is 340 m / s?
Initial data: L (distance to the sound-reflecting obstacle) = 68 m.
Reference data: according to the condition, we take V (speed of sound in air) = 340 m / s.
1) The distance that the sound must overcome: S = 2 * L = 2 * 68 = 136 m.
2) The time when a person hears an echo from a sound: t = S / V = 136/340 = 0.4 s.
Answer: A person will be able to hear an echo in 0.4 s.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.