Which of the following statements is false? A bubble raft can demonstrate vacanc

Question

Which of the following statements is false? A bubble raft can demonstrate vacancies and solute atom defects. Plastic deformation in a bubble raft occurs by dislocation motion. Screw dislocations can be seen in the bubble raft. Bubbles in a well-formed bubble raft are close-packed. Which of the following statements best describes the nature of dislocations in an amorphous material? Amorphous materials cannot contain dislocations. The dislocation density in an amorphous material is normally less than the dislocation density in a crystalline material with the same composition. The dislocation density in an amorphous material is normally greater than the dislocation density in a crystalline material with the same composition. A dislocation in an amorphous material must be of the edge type. 6. What are the conventional units of dislocation density? m2 m3 kg m-3 kg m-2

Explanation / Answer

Q6.The dislocation density is a measure of how many dislocations are present in a quantity of a material. Since a dislocation is a line defect, this is defined as the total length of dislocation per unit volume. Consequently the units are m/m3 = m-2 . So option (a) is answer

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