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Questions that I struggle on

1. What happens to the ultrasound which reaches the boundary between two different media and is not
reflected?

It is absorbed into the surroundings and then transmitted.

2. How can you tell, from the diagrams, that it is the same musical note?

Same pitch.

3.…

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Concave mirror: where the bear sleeps





Convex mirror: where the bear can't get in







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