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Challenge Question

Q1 ) What is an "Echo "  and how is it caused ?

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Ans : Sound does not travel in a vacuum because sound travels through air and in a vacuum there  is no air .

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sala pictures from kris

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challenge question

Why doesn’t sound travel in a vacuum?

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when the cochlea vibrates the fluid vibrates.

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5. Sound can be modified
The properties of sound are:
1) Sound can be reflected and absorbThe ed
2) Sound is caused by vibrations
3) Sound travels in a longitudanal wave
4) Sound travels in all medium

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What would be a good material to put on the floor to muffle the sound and why?

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muffle is to quiet a sound, usually by wrapping it with something. If you try to speak with a scarf over your mouth, your voice will be muffled. When a hitman puts a silencer on a gun, he's muffling the sound of gunshots, since muffling makes things quieter.

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sounds reflects and bounces off the walls of the tunnel.

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Draw a diagram to explain longitudinal waves?(on your white board)

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Ans 6: The property showed that sound travels through liquids .

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Sound can  be  defined as a disturbance through some medium traveling  by vibrations

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Source: Strings

Medium: Air

Source of Sound: Vibrations

CHALLENGE QUESTION!
What will happen if we loosen the strings of the guitar and play it? Which sound will it make? Why

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Ans 4: sound is caused by vibrations .
We feel the vibration and can know if the train is close by.
The train tracks are solid and sound travels fastest  through solids .
sound travels through solids and it is faster in solids than gas.

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6.Dolphins can communicate in the oceans.Explain

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6.Dolphins can communicate in the oceans.Explain

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Which property of sound it shows?

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4. I can hear sound of the coming train if i put my head on the railways track.

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4. I can hear sound of the coming train if i put my head on the railways track.

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Which property of sound it shows?

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3. name the source and the medium . What has caused the sound.

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3. name the source and the medium . What has caused the sound.

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Make a flow chart