Write at least two precautions which should be used in the experiment of reflection of sound?

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Solution

Precautions which should be used in the experiment of reflection of sound:
(1) The angle of reflection of sound waves should be determined carefully, till the sound heard is the loudest.
(2) No direct sound waves from the source should reach the listener.

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Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?

(a) We should never touch a lighted electric bulb connected to the mains

(b) We should never experiment with the electric supply from the mains or a generator or an inverter

(d) We should never turn the switch in ON position

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