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Consider a square (2-D) metallic cavity of side L that has trapped radiation inside it. Find out the number of standing waves, whose direction of

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Consider a square (2-D) metallic cavity of side L that has trapped radiation inside it. Find out the number of standing waves, whose direction of propagation make an angle of sin1(3/ 5) to one wall, that are allowed Within a range (A, A+dA), assuming A

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