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Activity 11.2
Take a small funnel of 6-7 cm in
diameter. Fix a rubber tube (50 cm long
tightly on the stem of the funnel. Stretch
a rubber sheet (or a balloon) on the
mouth of the funnel and fix it tightly
with a rubber band. Put the open end
of the tube on one of your ears. Place
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im sorry but i dont understand the question
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