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3 years ago BidishaKashayap1333 class 9 sound lakhmir singh The velocities of sound waves in four media P, Q, R, and S are 18000 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance? 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh When the pitch of note produced by a harmonium is lowered, then the wavelength of the note: 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance? 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh The sound waves travel fastest (a) in solids (b) in liquids (c) in gases (d) in vacuum 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh The maximum speed of vibrations which produce audible sound will be in: 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh In the sound wave produced by a vibrating tuning fork shown in the diagram, half the wavelength is represented by 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Sound travels in air: (a) if particles of medium travel from one place to another (b) if there is no moisture in the atmosphere 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Which one of the following does not consist of transverse waves? 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Which of the following vibrates when a musical note is produced by the cymbals in an orchestra? 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Which of the following statement best describes frequency? (a) the maximum disturbance caused by a wave (b) the number of complete vibrations per second 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why? (b) How could you convince a small child that when you speak, it is not necessary... 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Explain the terms ‘crests’ and ‘trough’ of a wave? What type of waves consist of crests and troughs? (b) The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man. 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Explain the terms ‘compression’ and ‘rarefactions’ of a wave. What type of waves consists of compression and rarefaction? (b) A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams. (b) Give two examples each of longitudinal waves and transverse waves. 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Define the terms ‘frequency’, ‘wavelength’, and ‘velocity’ of a sound wave. What is the relation between them? (b) A body vibrating with a time period of 1/256 s produces a sound wave which travels in air with a velocity of 350 m/s. 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh An electric bell is suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the glass vessel. (b) Why cannot a sound be heard on the moon? How do astronauts talk to one anoth... 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh How is sound produced? Explain with the help of an example. (b) How does sound from a sound producing body travel through air to reach our ears? 3 years ago BidishaKashayap1333 class 9 sound lakhmir singh Page 1 / 5 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? Δ Home About Us Contact Us Privacy Policy Term of Use Copyright © 2020 Eanshub All Rights Reserved
