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What is the phase difference when two waves,traveling in the same medium,undergo constructive interference?
Nonessential Goods
Goods considered as luxuries or not necessary for basic living, often subject to reduced spending during economic downturns.
Expensive
Involving high cost or price; something that is costly.
Cheap
Describes goods or services that are available at a low cost, making them easily affordable.
Paradox
A statement or proposition that, despite sound reasoning from acceptable premises, leads to a conclusion that seems logically unacceptable or self-contradictory.
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