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Consider standing waves in an air column with one end closed. What is a pressure node?

(a) Pressure variation is maximum

(b) Displacement variation is minimum

(c) Same as displacement node

(d) Least pressure change

The question was asked by my college director while I was bunking the class.

My doubt is from Reflection of Waves topic in chapter Waves of Physics – Class 11

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Right choice is (d) Least pressure change

For explanation: The point where there is an antinode corresponds to maximum amplitude of displacement. This also implies that here, pressure changes are minimum and it is therefore called a pressure node.

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