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The fundamental frequency of an open-open tube is 1500 Hz when the tube is filled with 0°C helium. What is its frequency when filled with 0°C air?

Short Answer

Expert verified

The frequency of the tube when it is filled with air at0°Cis512Hz.

Step by step solution

01

Given information

The fundamental frequency of the open-open tube isf=1500Hz.

02

Frequency of the tube when it is filled with air

For the open-open tube, the fundamental frequency of the standing wave is 1500Hz when the tube is filled with helium gas at0°C.

For the open-open tube, the fundamental frequency of the standing wave is λ=2Lm.

When the tube is filled with helium gas the fundamental frequency will be

role="math" localid="1650026727240" fhelium=vheliumλ1=970m/s2L⋯(1)

When the tube is filled with air the fundamental frequency will be

role="math" localid="1650026757106" fair=vairλ1=331m/s2L⋯(2)

From (1) and (2)

fairfhelium=331970fair=331970×1500=512Hz

Therefore, the frequency of the tube when it is filled with air at0°Cis512Hz.

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