John made a stethoscope using a paper cup and plastic tube write drwn the procedure he followed
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To prepare a stethoscope with paper cup and plastic tube, attach the plastic tube to the paper cup by making a hole in it and inserting the tube through it. The paper cup can then be placed on the chest and the tube on the ear. You will hear some sounds through the tube when the heart beats.
JAI SHRI RAM
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