Question 4 a) FIGURE 3 show the dispersion curve diagram of solids. .... Rndeced we e FIGURE 3 (a) Crystal A and (b) Crystal B ) Which one is monoatomic? Name one example of it. i) Which one is Diatomic? Name one example of it. b) For 1-D diatomic crystal lattice, the dispersion curve (@ versus k) has two branches, the optical phonon branch and the acoustical phonon branch. state the importance of the dispersion curve? c) For optical phonon waves, what happen when - K=0 - K=

Question 4 a) FIGURE 3 show the dispersion curve diagram of solids. .... Rndeced we e FIGURE 3 (a) Crystal A and (b) Crystal B ) Which one is monoatomic? Name one example of it. i) Which one is Diatomic? Name one example of it. b) For 1-D diatomic crystal lattice, the dispersion curve (@ versus k) has two branches, the optical phonon branch and the acoustical phonon branch. state the importance of the dispersion curve? c) For optical phonon waves, what happen when - K=0 - K=