Q1 of 12 Page 137

Fill in the blanks and explain.

Sound does not travel through …………

Vacuum

Explanation: Sound is a mechanical wave. As all mechanical waves require a material medium to travel, sound can also travel only in material media. As vacuum is not a material medium, sound cannot travel in vacuum.


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1

Fill in the blanks and explain.

The velocity of sound in steel is …............ than the velocity of sand in water.

 1

Fill in the blanks and explain.

The incidence of ……… in daily life shows that the velocity of sound is less than the velocity of light

 1

Fill in the blanks and explain.

To discover a sunken ship or objects deep inside the sea, ....................... technology is used.

 2

Explain giving scientific reasons.

A. The roof of a movie theatre and a conference hall is curved.


B. The intensity of reverberation is higher in a closed and empty house.


C. We cannot hear the echo produced in a classroom