Rohan blows air with a straw near the opening of another straw which has its other end in a soft drink bottle. The level of the soft drink in the straw rises up as air is blown over its open end. What will be the best reason for rise in level of the drink?

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Solution

When we blow the air over the open end, air inside the pipe comes out due to which vacuum is created inside the pipe and liquid rises up in the air.

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Question 3

Figure shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?

(a) Blowing of air decreases pressure over the opening of the straw.

(b) The straw of the soft drink bottle collapses when air is blown over its open end

(d) Blowing of air increases the pressure on the surface of soft drink in the bottle.

Q. While drinking a soft drink with the help of a straw the pressure in the straw is _____ and the pressure in the bottle is ________.

Q. When we drink a soft drink with the help of a straw, what forces the liquid up the straw?

Q. When a drinking straw is placed in a cup of water, the water level rises because of

If you blow air over the top of a fairly large drinking straw you can hear a fundamental frequency due to a standing wave being set up in the straw. What happens to the fundamental frequency if while blowing you cut the straw in half with a pair of scissors?

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