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question_answer1) Sound cannot travel through ______
question_answer2) Vibrating bodies produce _________
question_answer3) The sound travels fastest is_______
question_answer4) The instrument used in the laboratory to produce sound of fixed frequency is ____
question_answer5) Sound travels ____.
question_answer6) The speed of a sound in gas
question_answer7) Echo is a type of
question_answer8) To hear distinct echo, the minimum distance of a reflecting surface should be
question_answer9) Which one of the following material will reflect sound better?
question_answer10) Multiple echoes are also called
question_answer11) An echo of the sound produced can be heard only if it reaches our ear after
question_answer12) A boy standing 70m from a high wall claps his hands. After how much time is an echo heard? (The speed of sound in air is\[350\text{ }m{{s}^{-1}}\])
question_answer13) If you hear a gun shot 2 seconds after it is fired, how far away from the gun are you? (speed of sound in air = 330 m/s)
question_answer14) Statement I: Reflection of sound is called echo. Statement II: SONAR is working based on principle of echo.
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