Q1 of 12 Page 137

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

lightning during thunders

Explanation: During thundering, we observe lighting first and the sound is heard later. This proves that velocity of light is greater than velocity of sound.


More from this chapter

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1

Fill in the blanks and explain.

Sound does not travel through …………

 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.

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