LON-CAPA Course C LON-CAPA oblem Kingdom Hearts 3- SURVIVING FALL FF Watch F 5 D
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LON-CAPA Course C LON-CAPA oblem Kingdom Hearts 3- SURVIVING FALL FF Watch F 5 Digimon World: NetR Rainy Mood Most VisitedO Getting Started S Solarmovie- William Amponsah? (Student -section: 901) Mai Menu | Contents Grades syllabus tyBooks Logout Home- FAFSA on the .L LON-CAPA The Leami. HYS 320 (Spring 2018) 2 Messages Courses Help Logout Course Contents Homework for Topic 7. Solid State Physics » Problem 1- Concentration.problem 4 O Notes EvaluateFeedback Using "unit analysist, find the total number N of Cu atoms (M 63.55 g/mole, p 8.96 g/cm3 n a Cu wre of length is 0 m and diameter of 0.1 mm. Assuming that each atom of Cu provides one free electron, find the concentration of free electrons in this wire (n 1/cm3)? cm-3 Submit Answer Tries 0/3 Post Discussion Send Feedback O Type here to search 030 AMExplanation / Answer
r = d / 2 = 0.1 mm / 2 = 5 * 10-5 m
volume = pi r2 h = pi * (5 * 10-5)2 * 150 = 1.18 cm3
mass = volume * density = 1.18 * 10-6 * 8960 = 10.55 g
Number of Cu atoms = (6.022 * 1023 * 10.55) / (63.55) = 9.99 * 1022
Total number N of Cu atoms = 9.99 * 1022 / 1.18
= 8.47 * 1022 cm-3 = 0.847 * 1023 cm-3
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