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A mercury barometer is defective. When a...

A mercury barometer is defective. When an accurate barometer reads `770` mn, the defective one reads `760` mn. When the accurate one reads `750` mn, the defective one reads `742` mn. Then
The length of air coloumn when accurate barometer reads `770`mm is

A

`76mm`

B

`74mm`

C

`72mm`

D

`70mm`

Text Solution

Verified by Experts

The correct Answer is:
C
Let `A` be the cross section and `L` be the length
`P_(1)=770-760=10mm P_(2)=750-743=8`
`P_(1)v_(2)=P_(2)v_(2)implies10L=8(L+18)implies2=72` mm
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