First slide

Standing waves

Question

What is the base frequency if a pipe gives notes of frequencies 425, 255 and 595 and decide whether it is closed at one end or open at both ends?

Moderate

A

17, closed
B

85, closed
C

17, open
D

85, open

Solution

Let the base frequency be n for closed pipe then notes are n,3n,5n ...
$∴ Note 3 n = 255 \Rightarrow n = 85, Note 5 n = 85 \times 5 = 425$
Note $7 n = 7 \times 85 = 595$

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