) What does it look like for two atoms per unit cell? Why does one speak of optical and acoustic branches?
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![2) What does it look like for two atoms per unit cell? Why does one speak of
optical and acoustic branches?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbb765cd5-721f-490c-a16c-ed52239d1bf2%2Fac0849cb-9a86-415e-b9ca-b21eefef45f5%2Fj5zzc4q_processed.png&w=3840&q=75)
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