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Category: Class 9

What is the range of frequencies associated with (a) Infrasound? (b) Ultrasound?

Class 9 Physics Sound
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What is the audible range of the average human ear?

Class 9 Physics Sound
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Why are the ceilings of concert halls curved?

Class 9 Physics Sound
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QUESTION : How did Montmorency ‘contribute’ to the packing?

Class 9 English
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QUESTION : Of the three, Jerome, George and Harris, who do you think is the best or worst packer? Support your answer with details from the text

Class 9 English
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QUESTION : What does Jerome say was Montmorency’s ambition in life? What do you think of Montmorency and why?

Class 9 English
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QUESTION : What did George and Harris offer to pack and why?

Class 9 English
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QUESTION : Why did Jerome have to reopen the packed bag?

Class 9 English
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An echo is heard in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s–1?

Class 9 Physics Sound
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In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?

Class 9 Physics Sound
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Distinguish between loudness and intensity of sound.

Class 9 Physics Sound
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A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

Class 9 Physics Sound
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