To hear a distinct echo, the time interval between the original sound and the reflected sound must be at least ______ seconds.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer:
Option 2: 0.1 seconds
Explanation:
To hear an echo clearly, there must be a minimum time interval of 0.1 seconds between the original sound and the reflected sound. If this interval is shorter, the two sounds merge and are not perceived as distinct. This relates to the sensitivity of the human ear. Based on the speed of sound (approximately 340 m/s), the minimum distance required to hear an echo is approximately 17 meters.
Potential Questions for Upcoming Exams:
Question: What is the speed of sound?
Answer: Approximately 340 m/s
Question: How is an echo produced?
Answer: Through reflection
Question: On what principle does SONAR operate?
Answer: Sound reflection
Question: What type of wave is a sound wave?
Answer: Longitudinal wave