B. Statements given below are incorrect. Write the correct statements : 1. Sound can easily propagate through vacuum. 2. Sound travels slower in solids as compared to liquids. 3. During a thunder storm, the crack of thunder is heard first and then the flash of lightning is seen. 4. When the sound travels in air, the particles of air vibrate differently compared to the vibrations of the vibrating body. 5. Material medium is not necessary for the transmission of sound.
Answers
Explanation:
1) Incorrect, Sound waves cannot travel in a vacuum. This is because sound waves are mechanical waves that need a medium (such as air and water) to travel.
2) Incorrect, Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. The distances in liquids are shorter than in gases, but longer than in solids. ... Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.
3) Correct, Lightning is seen earlier and thunder is heard later because the speed of sound is 330 m/s and the speed of light is 300,000,000 m/s. Light travels faster than a sound.
4) Correct, When the sound travels in air , the particles of air vibrate safely as the vibrating body.
5) Incorrect, Sound is a mechanical wave and propagation of mechanical wave is possible only when there is a medium. So medium is necessary for propagation of sound.
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