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Fill inthe blanks:
1. The speed of light is 106 times than that of sound.
2. Noise Pollution is a social problem.
3. The speed of sound in air is 340 m/sec.
Match the Pair:
1. Reflection of sound- Echo Point
2. Medium of sound- Water
True or False:
1. Sound is reflected from a curved surface - False
2. Vibration is necessary for the production of sound. - True
Answer in one sentence:
1. In which medium the velocity of sound is less?
Ans: The velocity of sound is less in air.
2. How sound is produced in a drums?
Ans: In a drum a stretched membrane is struck to produce sound.
Answer in Short:
What is meant by Eco?
Ans: Repetition of a sound by reflection of sound waves from a surface is called echo. Generally echo is heard at mountains where sound is reflected from other mountain surface. Echo is heard after some interval because sound takes some time to reflect from other side.
Answer in One Word:
1. Vibrations produced by a flute - Air column
2. Speed of Sound- 340 m/sec
Distinguish Between:
Give Reasons:
Give Reasons:
1. A surface is necessary for an echo to hear.
Ans: An echo is heard when sound is reflected in a direction in which it come. Sound only reflected from a surface. So, for production of echo a surface is necessary.
Complete the table:
SOUND: Propagation of Sound
