Uttam and Nitesh are standing at 12 m and 20 m respectively from a cliff. They startshouting their names. They want to hear clear echo of their sound.(a) Will Nitesh and Uttam be able to hear a clear echo of their own sound?(b) Can you explain the condition for a sound to form an echo?
Question
Uttam and Nitesh are standing at 12 m and 20 m respectively from a cliff. They startshouting their names. They want to hear clear echo of their sound.(a) Will Nitesh and Uttam be able to hear a clear echo of their own sound?(b) Can you explain the condition for a sound to form an echo?
Solution
(a) Yes, both Uttam and Nitesh will be able to hear a clear echo of their own sound. This is because the minimum distance for echo to be heard is approximately 17.2 meters. Since both of them are standing at distances greater than 17.2 meters from the cliff, they will be able to hear their echoes clearly.
(b) The condition for a sound to form an echo is that the distance between the source of sound and the reflecting surface should be at least 17.2 meters. This is because sound travels at a speed of 344 meters per second, and our brain retains a sound for about 0.1 seconds. So, for us to hear two distinct sounds (the original sound and its echo), the sound needs to travel a minimum distance of 17.2 meters (344 m/s * 0.1 s = 17.2 m). If the distance is less than 17.2 meters, the echo will merge with the original sound and will not be heard as a separate sound.
Similar Questions
Name the waves used for echo depth sounding.(b) Give one reason for their use in the above application.
You can hear an echo when the sound wave reflects from the wall and reaches you.If you hear an echo, 4 seconds after you produce the sound, how far is the wall?Use a speed of sound of 340 m/s for this question. 340 meters away from you You Answered 1360 meters away from you Correct Answer 680 meters away from you 10 meters away from you
Echo of sound wave is due toSelect an answerArefractionBreflectionCdiffractionDNone of these
Erika visits the Grand Canyon with her family. When she shouts near the edge, she can hear her voice echo throughout the canyon. Which statement describes why Erika hears her echo? A. The sound was loud. B. The sound waves travelled in a vacuum. C. The sound waves reflected off the canyon walls. D. The sound waves bent as they travelled into the canyon.
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sounds on a hotter day?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.