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Which phenomenon of light is shown in fi...

Which phenomenon of light is shown in fig below:

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The correct Answer is:
9
`P_(f)=1+(36)/(76)=(112)/(76)atm."final height" =19 cm`
`P_(i)=1atm,"initial length"=h_(i)cm`
`:. "Boyle's law "P_(i)V_(i)=P_(f)V_(f)`
`1xxh_(i)A=(112)/(76)xx19A`
`h_(i)=28cm`
`:.` The length by which the Hg column shifts down `=h_(i)-h_(f)`
`=28-19=9cm`
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