Question

how does harmonium produce sound​

Answer 1

Answer:

In a plane mirror if the mirror moves at speed of v, then the image moves at a speed of 2v.

So, in this case, as mirror is moving at a speed 10 cm/s, the image will move at a speed of (2)×(10)cm/s =20cm/s

Explanation:

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Answer 2

harmonium, also called Reed Organ, free-reed keyboard instrument that produces sound when wind sent by foot-operated bellows through a pressure-equalizing air reservoir causes metal reeds screwed over slots in metal frames to vibrate through the frames with close tolerance.