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Question
Four test tubes are filled with different levels of water as shown below. When air is blown from the top of a test tube mouth one by one, identify which test tube will produce a high-pitched sound.
Four test tubes are filled with different levels of water as shown below. When air is blown from the top of a test tube mouth one by one, identify which test tube will produce a high-pitched sound.
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Solution
The correct option is A S
- When air is blown into a test tube with little water in it, a flat sound is heard.
- On adding more and more water in the test tube, the length of the vibrating air column above water level decreases.
- We know that the frequency of vibrations increases as the length of a vibrating body decreases.
- Therefore, the sound produced becomes more and more shrill (high-pitched sound) as we add more and more water into the test tube.
- From, the given options, test tube S has a higher water level and hence, it has lower space for the air column to vibrate, and due to that it will produce a high-pitched sound.
- When air is blown into a test tube with little water in it, a flat sound is heard.
- On adding more and more water in the test tube, the length of the vibrating air column above water level decreases.
- We know that the frequency of vibrations increases as the length of a vibrating body decreases.
- Therefore, the sound produced becomes more and more shrill (high-pitched sound) as we add more and more water into the test tube.
- From, the given options, test tube S has a higher water level and hence, it has lower space for the air column to vibrate, and due to that it will produce a high-pitched sound.
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