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In power supply theI talkiI unatAt the start of experiment, the vemp is off and the bell-jar contains air teto electric bell is now switched on the bellstart ringing and the ringing can be heard fromoutside the bell jar. Now, if the vacuumis switched on, it starts removing the air fromthethe bell jar. As the quantity of air inside the bell mofor decreases, the level of ringing sound heard thenoutside also decreases. If the pump is operated forfor sufficiently long period, the quantity of air Solike inside the bell jar will be low. At this pointthe level of ringing sound will also be verylow. This experiment demonstrates that sounddnronation needs a medium, |
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