A) half
B) double
C) remain same
D) four time
Correct Answer: C
Solution :
Frequency of open organ pipe is double than that of closed pipe. If frequency of open pipe = n \[\therefore \]frequency of closed pipe \[=\frac{n}{2}\] On inserting a open pipe into water upto half of its height, it will behave like a closed pipe of half length and frequency is inversely proportional to the length of air column. Frequency of closed pipe will become double \[=2\times \frac{n}{2}=n\]
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