2. Determine the (hkil) indices for the planes shown in the hexagonal unit cells below (a), (c). and (d).

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Questions are in the picture.

A cryogenic vacuum pump works by condensing vapors onto some absorbent medium. This is an efficient and clean way to pump a system in a research environment. The term cryo means cold, which indicates that these types of vacuum pumps contain a refrigerant cycle to cool the internal parts. The temperature difference between the inside and outside of a typical cryogenic pump is Δ?=303 ∘CΔT=303 ∘C. Derive an expression to convert this difference into Fahrenheit and express the answer.