What is minimum distance for an echo to be produced?

Asked by Last Modified  

22 Answers

Learn Class IX-X Tuition

Follow 15
Answer

Please enter your answer

Rashmi Kakra

Science and Maths tuition for CBSE and ICSE Board

The minimum distance required for an echo to be produced is 16.6 m. Consider an observer producing a sound at a distance x from a rigid surface. The person hears the first sound as soon as it is produced and next when it travels through a total distance of 2x i.e. (x+x) for approaching the surface and...
read more
The minimum distance required for an echo to be produced is 16.6 m. Consider an observer producing a sound at a distance x from a rigid surface. The person hears the first sound as soon as it is produced and next when it travels through a total distance of 2x i.e. (x+x) for approaching the surface and and for returning to the observer.Since the standard speed of sound internationally accepted is 332 m/s and to hear the 2 sounds distinctly i.e., for formation of echo, the minimum speed required is 0.1 second. Accordingly, Speed(S)=Distance(d)/Time(t) or, distance = speed*time or, 2x = 332 m/s * 0.1 s s and s gets cancelled.. or, x = 332 *0.1 m /2 or, x = 33.2 m /2 or, x = 16.6 m (Answer) read less
2 Comments
Dislike Bookmark

Tutor

To hear the echo clearly the reflecting wall or surface must be at least 17m away.
Comments
Dislike Bookmark

PGT-Physics

As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. If we take the speed of sound to be 344 m/s at a given temperature, say at 22 ºC in air, sound must go to the obstacle and...
read more
As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. If we take the speed of sound to be 344 m/s at a given temperature, say at 22 ºC in air, sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s. Hence, the total distance covered by the sound from the point of generation to the reflecting surface and back should be at least (344 m/s) ×0.1 s = 34.4 m. Thus, for hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be half of this distance. I.e., 34.4/2 = 17.2 m [given speed of sound 344m/s] read less
Comments
Dislike Bookmark

Home Tutor

When dealing with audible frequencies, the human ear cannot distinguish an echo from the original sound if the delay is less than 1/15 of a second. Thus, since the velocity of sound is approximately 343 m/s at a normal room temperature of about 25 °C, the reflecting object must be more than 11.3 m from...
read more
When dealing with audible frequencies, the human ear cannot distinguish an echo from the original sound if the delay is less than 1/15 of a second. Thus, since the velocity of sound is approximately 343 m/s at a normal room temperature of about 25 °C, the reflecting object must be more than 11.3 m from the sound source at this temperature for an echo to be heard by a person at the source. Sound travels approximately 343 metres/s (1100 ft/s). If a sound produces an echo in 2 seconds, the object producing the echo would be precisely that distance away (the sound takes half the time to get to the object and half the time to return). The distance for an object with a 2-second echo return would be 1 sec X 343 metres/s or 343 metres (1100 ft). In most situations with human hearing, echoes are about one-half second or about half this distance, since sounds grow fainter with distance. read less
Comments
Dislike Bookmark

Tutor

Depends on the quality of the sound. The minimum distance to hear an echo will be partly based upon the observers ability to resolve different sounds (i.e. so that they can distinguish between the actual noise, and the arrival of the reflected sound - a little 100 year old lady may not be as good as...
read more
Depends on the quality of the sound. The minimum distance to hear an echo will be partly based upon the observers ability to resolve different sounds (i.e. so that they can distinguish between the actual noise, and the arrival of the reflected sound - a little 100 year old lady may not be as good as a 15year old!). This will vary between observers, as their auditory reaction times vary In the perfect Physics world though: Assuming a sharp sound (like a gunshot) the minimum distance (d=vt) to hear distinct echo is 17.2m considering the speed of sound to be 344ms. In general the "minimum echo distance" is always equal to half a wavelength from the reflector. read less
Comments
Dislike Bookmark
17.5 if speed is 350 m/s
Comments
Dislike Bookmark

Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

It should be minimum double distance between source and sound reflector
Comments
Dislike Bookmark
16.5 approximately
Comments
Dislike Bookmark

B.Tech, Spoken English, EEC, MATLAB, CET Coaching Tutor with 20 years of experience

Depends on the quality of the sound. The minimum distance to hear an echo will be partly based upon the observers ability to resolve different sounds (i.e. so that they can distinguish between the actual noise, and the arrival of the reflected sound - a little 100 year old lady may not be as good as...
read more
Depends on the quality of the sound. The minimum distance to hear an echo will be partly based upon the observers ability to resolve different sounds (i.e. so that they can distinguish between the actual noise, and the arrival of the reflected sound - a little 100 year old lady may not be as good as a 15year old!). This will vary between observers, as their auditory reaction times vary In the perfect Physics world though: Assuming a sharp sound (like a gunshot) the minimum distance (d=vt) to hear distinct echo is 17.2m considering the speed of sound to be 344ms. In general the "minimum echo distance" is always equal to half a wavelength from the reflector. read less
Comments
Dislike Bookmark

Don't want to over express myself, just join and feel the experience.

17.2m
Comments
Dislike Bookmark

View 20 more Answers

Related Questions

What are the uses of a concave mirror?
It mostly usages into as the side view mirror and rear view mirror for the motor vehicles too seeing the big objects in small.
Shagufta
0 0
View Comments9
What is gram molecular mass?
Gram Molecular mass is the mass in gram of a molecular substance. Example:The molecular mass of(Nitrogen) N2 is 28,So the gram molecular mass of N2 is 28 g.
Ravi Ranjan
What is element and compound definition?
An element contains the same type of atoms. e.g., Hydrogen, Oxygen etc.A compound contains different types of atoms. e.g., Carbon-di-oxide, Ammonia etc.
Ravi Ranjan
How sound pitch is measure?
DECIBALS (db)
Chandramami
anybdy till class x and in any subject....guys if u r having doubts and want home tution in group....i just wanna assure that i can help u..i have scored myself 94% in xth....and air-94 in gate exam...TEACHING IS MY PASSION..
If you got AIR 94 in GATE then go for M Tech and then come back for teaching.. All the best
Ravi Ranjan
2 6
View Comments8

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Key to success in exams
key to success in any exam is well planned studying and repeated revision.
N

Namratha

0 0
View Comments0
Repeated learning
When you learn something and even if you are thorough, it is better to learn the same thing after a week or two. This will help you understand the topic well.

Saraswathi S.

0 0
View Comments0
Reducing Fractions to Lowest Terms
Consider the following two fractions: 1/2 and 2/4 These fractions are equivalent fractions. They both represent the same amount. One half of an orange is equal to two quarters of an orange....
A

Amrtha S.

0 0
View Comments0
Assignment On Force And Pressure
ASSIGNMENT: 1 Force And Pressure: Q1) Fill in the blanks: a. A force arises due to __________ between two objects. b. An example of a non-contact force is __________. c. The pressure exerted by air...

Soumi Roy

2 0
View Comments0
Differences Between Ascorbic Acid and Citric Acid
Ascorbic acid is found in citrus fruits as well as citric acid, but citric acid does not contain Vitamin C.Ascorbic acid is natural, citric acid is man-made, hence, synthetic.Ascorbic acid is a great preservative.Citric...

Debraj Paul

0 0
View Comments0

Recommended Articles

Meet Mohammad Wazid, a skilled trainer for...

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Quest Academy - Institute of the month

Quest Academy is a professional Bangalore based NEET and JEE (Main + Advanced) training institute. The academy was incorporated in 2015 to cater to the needs of students, who aim to crack competitive exams by connecting with the best brains around. The institute helps students enhance their skills and capabilities through...

Read full article >

Meet Raghunandan.G.H, a B. Tech Tutor from...

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

Find Class 10 Tuition near you
Class 10 Tuition in Delhi
Class 10 Tuition in Bangalore
Class 10 Tuition in Hyderabad
Class 10 Tuition in Kolkata
Class 10 Tuition in Mumbai
Class 10 Tuition in Chennai
Class 10 Tuition in Pune
Class 10 Tuition in Lucknow
Class 10 Tuition in Noida
Class 10 Tuition in Jaipur
Online Tuition Class 10

Looking for Class 10 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you