PDF chapter test TRY NOW

Take a metre scale or a long metal rod and hold its one end to your ear. Ask your friend to gently scratch or tap the other end of the scale.

Can you hear the sound of the scratch? Ask your friends around you if they were able to hear the same sound?
 
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, it turns out that we  the scratch's sound. The individuals gathered around us, however, are  the same sound, or we may claim that the sound is  to them. 
Important!
This is an activity-based exercise. Do the activity and answer questions.