If you hear the thunder 20 seconds after...

If you hear the thunder 20 seconds after you see the flash of lightning, how far from you hasthe lightning occurred? (Speed of sound in air = `340 m/s`)

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Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her? (The velocity of sound in air is 340 m//s )

afires a gun. He heard the echo of the sounds from the first building after 2 seconds and echo i from the second building after 3 seconds. Find the distance between two buildings. (Speed of sound in air = 340 m/s )

Solve the following example: A person standing between two hills fired a gun and heard the first echo after 0.5 s and the second echo after 0.9 s. Find the distance between two hills. (speed of sound in air =340 m//s )

A person standing between two hills fired a gun heard the first echo after 0.6s and the second echo after 1s. Find the distance between the two hills. (speed of sound in air =340m//s )

Answer the following question orally: Have you seen a flash of lightning in the sky? When?

A man shouts loudly close to a high wall. He hears an echo. If the man is at 40 m from the wall, how long after the shout will the echo be heard? (speed of sound in air = 330 m//s )

A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? (speed of sound in the air = 340m/s)

A man sets his watch by a whistle that is 2 km away. How much will his watch be in error (speed of sound in air 330 m//s ) ?

A soldier standing between two hills hears two echoes after firing the gun. The first echo is heard after 1.2s and the second echo after 2.4s. Find the separation between the two hills.(speed of sound in air = 340m//s )

Answer the following questions: What can you say about variation of the speed of sound in air with temperature?

CHETANA PUBLICATION-MAS03-EXERCISE

Give scientific reasons: Bleaching powder has the odour of chlorine.
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Give the uses of coal?
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If you hear the thunder 20 seconds after you see the flash of lightnin...
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An object 10 cm in height is placed at a distance of 36 cm from a conc...
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The speed of sound in air at 0^@C is 332 m//s. If it increases at the ...
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Give structural formula and electron dot model of methane.
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What is an echo? What factors are important to get a distinct echo?
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Write a short note on biogas plant. (3) Give the properties and uses o...
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Explain the sign conventions for reflection by spherical mirrors
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Hydrogen gas is filled in two identical bottles, A and B, at the same ...
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Explain the following SCImical reactions with the help of a balanced e...
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Explain the following SCImical reactions with the help of a balanced e...
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Write the properties and uses of Teflon.
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Draw ray diagram for object at infinity for a concave mirror.
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Write in short note on SONAR?
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With the help of a neat labelled diagram, explain the laboratory prepa...
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The image made by a plane mirror is a ………….image.
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Molecular mass of methane is………….. .
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Sound waves with frequency greater than 20 kHz are called……….. .
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The ……….% aqueous solution of salt is called brine.
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