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Listening the sound produced by some material:a) Drop a piece of coal on the floor and listen the sound. Do you think coal is sonorous?b) Take the pieces of zinc, copper, aluminium, magnesium and tightly packed packets of sulphur, carbon and iodine. Drop them one by one, on a hard surface. Listen carefully to the sound produced and record your observation in table.c) What similarity do you notice among materials which produce sound?d) Which property of metals first attracted the attention of human beings?e) Do you bring a similar change in the shape of a clay material by beating it? |
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Answer» a) No B)
c) All of them are metals. d) Metals had the advantage of not just being harder but they could be heated in a fire and moulded or cast into different shapes. This property of metals first attracted the attention of human beings. e) Yes, we bring similar change in the shape of a clay material by beating it. |
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