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{"ops":[{"insert":"a) Define crystal and unit cell \nb) Explain de Broglie wave and the photoelectric effect. \nc) A wire of length 7 \ud835\udc5a and radius 2.37 \ud835\udc5a\ud835\udc5a is stretched by a load of 12370 \ud835\udc54\ud835\udc5a and increased by 1.78% of the original length. Find the stress, strain, and Young\u2019s modulus of the material of the wire.\u00a0\n"}]}
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