Question

The height of mercury in the barometer tube is 70
om due to entrapped air in it as shown in figure.
Now from this position tube is pulled up slightly,
then length of the mercury column in the tube willnot perfect
vacuum
(1) Remain 70 cm
(2) Slightly more than 70 cm
(3) Slightly less than 70 cm
(4) Can't say​

Answer 1

Answer:

(2) Slightly more than 70 cm

Answer 2

The correct option is 4) Can't say.

When a barometer tube containing mercury is pulled up slightly from its original position, the length of the mercury column in the tube will change. The new length of the mercury column will depend on the pressure of the entrapped air and the difference in pressure between the top and bottom of the column.

• If the pressure of the entrapped air is equal to the atmospheric pressure, then the length of the mercury column will remain at 70 cm.
• If the pressure of the entrapped air is less than the atmospheric pressure, then the length of the mercury column will be slightly less than 70 cm.
• If the pressure of the entrapped air is greater than the atmospheric pressure, then the length of the mercury column will be slightly more than 70 cm.
• The exact change in length cannot be predicted without knowing the pressure of the entrapped air and the difference in pressure between the top and bottom of the column.

In summary, the answer is (4) Can't say as it depends on the pressure of the entrapped air and the difference in pressure between the top and bottom of the column.

To learn more about pressure from the given link.

https://brainly.in/question/23273013

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