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What happens if you sprinkle paper pieces on a drumhead and the n hit the drumstick?

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What do you know about the person who first entered the space?

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How does transmittion, reflection and absorption occurs at the same time?

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Hiow sound travels more quickly in water than air?

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Write two applications of regular and defused reflection in everyday life.

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What is a satelite?

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Define viberation?

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What is meant by a shooting star,falling star or fireball?

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Give the structure of pin-hole camera?

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Write the name of parts of comet

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Define a mirror?

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What is microscope and how it works?

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How covering the ears can keep a person from hearing a sound?

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How does innner ear works?

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What is satellite receiving station?

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How were asteroids formed?

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What are the uses of convex mirror?

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Write two uses of periscope.

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How sound traveks in air?

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Define reflection?

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