A student claps once when standing 100 m away from a large wall. The speed of sound in air is 330 m/s.

How long after clapping does the student hear an echo?

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l think 2 times

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the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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