What is an echo?...

What is an echo?

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Sound heard after its reflection from obstacle

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SELF ASSESSMENT PAPER -1
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What is meant by an echo ? State two conditions necessary for an echo to be heard distinctly.

Why will an echo not be heard when the distance between the source of sound and the reflecting surface is 10 m ?

What is echo-location?

In the above problem, if some of the sound reaching the target ges reflected back to the rocket as an echo, then what frequency of the echo is detected by the rocket?

What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.

The speed of sound in water is 1600 m/s. A boat man hears an echo 3 s after sending an ultrasonic sound into the sea. What is the depth of the sea?

The speed of sound in water is 1500 m/s. A boat man hears an echo 3 s after sending a sound pulse into the sea. What is the depth of the sea?

Fill in the blank space by choosing the correct word from the list given below : List: ultrasonic, frequency, reflecting, sonar, amplitude For hearing an echo the minimum distance between the source of sound and the _________ body is 17 m.

A rocket is moving at a speed of 200ms^(-1) towards a stationary target. While moving, it emits a wave of frequency 1000 Hz. Some of the sound reaching the target gets reflected back to the racket as an echo. Calculate the frequency of sound as detected by the person at the position of target and frequency of echo as detected by the rocket . Given velocity of sound =330ms^(-1) .

A man standing in front of a wall produces a sound and hears an echo after 3 s. He walks .X. m away from the wall and produces the same sound. Now he hears an echo after 5.25 s. Calculate distance he walked away from the wall. (Speed of sound in air is 340 m/s)

ICSE-SELF ASSESSMENT PAPER -1-SECTION .B.

(a) Name the high energetic invisible electro magnetic wave which help...
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What is an echo?
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State two conditions for the formation of an echo.
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Name the phenomenon involved, in tuning the radio set.
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