Question

a) Define crystal and unit cell

b) Explain de Broglie wave and the photoelectric effect.

c) A wire of length 7 𝑚 and radius 2.37 𝑚𝑚 is stretched by a load of 12370 𝑔𝑚 and increased by 1.78% of the original length. Find the stress, strain, and Young’s modulus of the material of the wire. 

Answer 1

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