Answer
Verified
393.3k+ views
Hint: To be able to answer this question we should know what reflection of sound is, and in the reflection of sound , when the sound moves from one medium to alternative then it strikes the surface of medium and bounds back in the similar medium. So by using this information one can easily answer this question.
Complete Step by Step Solution: An echo can be defined as a reflection of sound that arrives at the listener with a delay after the direct sound. The time it takes to arrive is directly proportional to the distance of the reflecting surface from the source and the listener.
The necessary conditions for hearing an echo can be,
The distance between the sound source and the place where it is reflected from must not be less than ${\text{17m}}$ and the period between hearing the original sound and its echo should not be less than $0.1$ of a second.
The human ear cannot distinguish between two successive sounds if the time gap between them is less than $0.1\sec $ , and the place from where it is being reflected must be presented to hear the echo such as the walls, the mountains, or the water bodies.
The speed of sound while traveling in air is ${\text{340m/s}}$ , so the distance traveled by the sound and its echo in $0.1\sec $ would be ${\text{34m}}$ . The distance traveled by the sound is ${\text{17m}}$ from the sound source to the place where it will be reflected from and ${\text{17m}}$ from the same place to the ear.
When the distance between hearing the actual sound and its reflection is in the multiples of ${\text{17m}}$ , only the last two or three phases of the whole sound can be heard as an echo.
Note: We should rightly use the value of the speed of sound here then we can get the right value for the minimum distance at which the reflecting surface has to be otherwise the distance we get will be wrong and the answer will become wrong. So we have to be careful while putting the numerical values.
Complete Step by Step Solution: An echo can be defined as a reflection of sound that arrives at the listener with a delay after the direct sound. The time it takes to arrive is directly proportional to the distance of the reflecting surface from the source and the listener.
The necessary conditions for hearing an echo can be,
The distance between the sound source and the place where it is reflected from must not be less than ${\text{17m}}$ and the period between hearing the original sound and its echo should not be less than $0.1$ of a second.
The human ear cannot distinguish between two successive sounds if the time gap between them is less than $0.1\sec $ , and the place from where it is being reflected must be presented to hear the echo such as the walls, the mountains, or the water bodies.
The speed of sound while traveling in air is ${\text{340m/s}}$ , so the distance traveled by the sound and its echo in $0.1\sec $ would be ${\text{34m}}$ . The distance traveled by the sound is ${\text{17m}}$ from the sound source to the place where it will be reflected from and ${\text{17m}}$ from the same place to the ear.
When the distance between hearing the actual sound and its reflection is in the multiples of ${\text{17m}}$ , only the last two or three phases of the whole sound can be heard as an echo.
Note: We should rightly use the value of the speed of sound here then we can get the right value for the minimum distance at which the reflecting surface has to be otherwise the distance we get will be wrong and the answer will become wrong. So we have to be careful while putting the numerical values.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Advantages and disadvantages of science
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
10 examples of evaporation in daily life with explanations
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
How do you graph the function fx 4x class 9 maths CBSE
Difference Between Plant Cell and Animal Cell