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Raaunak

Feb 7, 2015

#### What is the difference between echo and reverberation?



If we shout or clap, near a tall building or a hill, we will hear the same sound back in a little time. This is called an echo.
A sound created in a big hall will persist by repeat...

BHAGYASHRI KUDARIHAL

Jan 9, 2015



Ritik Ranjan

Mar 1, 2015

#### Working of human ear.



The pinna collects the sound waves from the surroundings and sends it to ear canal. The ear canal sends the sound waves to the ear drum and s...

Shriya Sanjay Patil

Mar 5, 2014

#### Prove that for hearing distinct echo, minimum distance of the obstacle from source of sound must be 17.2m at 22 Celsius in air [given speed of sound 344m/s]. Answer:  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]



17.2 m at room temperature and normal humidity.

Masih

Jan 16, 2015



Alpha

Feb 17, 2015



Rushin Naik

Mar 1, 2015

#### A Stone is dropped into a well 44 meter deep and the sound of splash is heard after 3.12 sec. Find the speed of sound in air.



Time taken by the stone to reach the water surface  can be calculated using the equation of motio...

Mar 6, 2015

#### What is SONAR? How does it work?



Sonar, short for Sound Navigation and Ranging, is a technique that uses propagation of  sound waves  to communicate, navigate and detect the objects on or under the surfa...

Neha Sony

Nov 27, 2014

#### what  is reverberation ?



If the sound source is kept in an enclosed room the sound waves are reflected repeatedly from the walls which makes an echo. The echo time is so short and it overlaps with the orig...

Ravinder Ghanghas

Feb 27, 2014

Raaunak

Feb 7, 2015

#### What is the difference between echo and reverberation?



If we shout or clap, near a tall building or a hill, we will hear the same sound back in a little time. This is called an echo.
A sound created in a big hall will persist by repeat...

BHAGYASHRI KUDARIHAL

Jan 9, 2015



Ritik Ranjan

Mar 1, 2015

#### Working of human ear.



The pinna collects the sound waves from the surroundings and sends it to ear canal. The ear canal sends the sound waves to the ear drum and s...

Shriya Sanjay Patil

Mar 5, 2014

#### Prove that for hearing distinct echo, minimum distance of the obstacle from source of sound must be 17.2m at 22 Celsius in air [given speed of sound 344m/s]. Answer:  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]



17.2 m at room temperature and normal humidity.

Masih

Jan 16, 2015



Alpha

Feb 17, 2015



Rushin Naik

Mar 1, 2015

#### A Stone is dropped into a well 44 meter deep and the sound of splash is heard after 3.12 sec. Find the speed of sound in air.



Time taken by the stone to reach the water surface  can be calculated using the equation of motio...

Mar 6, 2015

#### What is SONAR? How does it work?



Sonar, short for Sound Navigation and Ranging, is a technique that uses propagation of  sound waves  to communicate, navigate and detect the objects on or under the surfa...

Neha Sony

Nov 27, 2014

#### what  is reverberation ?



If the sound source is kept in an enclosed room the sound waves are reflected repeatedly from the walls which makes an echo. The echo time is so short and it overlaps with the orig...

Ravinder Ghanghas

Feb 27, 2014

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