A person blows into a tube of length L that is open at one e

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A person blows into a tube of length L that is open at one end and closed at
A person blows into a tube of length L that is open at one end and closed at the other.What is the wavelength of the first harmonic of the tube?
一道SAT2物理题，答案是4L不太明白，为什么....
能仔细讲下么？

For a close-end pipe
1st harmonic:Wavelength = 4L
3nd harmonic:Wavelength = (3/4)L
5th harmonic:Wavelength = (4/5)L

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