ReasoningModerate2 marks
7(iii)
In the given diagram, a vibrating tuning fork is kept near the mouth of a burette filled with water. The length of the air column is adjusted by opening the tap of the burette. At a length of 5 cm of the air column, a loud sound is heard.
If the present tuning fork is replaced with a tuning fork of higher frequency, should the length of the air column increase or decrease to produce a loud sound? Give a reason.
Topic: Frequency and resonating air-column length
Question wording verified against source paper
Answer
Exam answer
Decrease.
Explanation
For the same mode, frequency is inversely proportional to the resonating air-column length; a higher frequency needs a shorter column.
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