Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, $$\gamma = \frac{{{{\text{c}}_{\text{p}}}}}{{{{\text{c}}_{\text{v}}}}},$$ known as adiabatic index and R = Gas constant)
A. $$\frac{{{{\text{c}}_{\text{v}}}}}{{{{\text{c}}_{\text{p}}}}} = {\text{R}}$$
B. $${{\text{c}}_{\text{p}}} - {{\text{c}}_{\text{v}}} = {\text{R}}$$
C. $${{\text{c}}_{\text{v}}} = \frac{{\text{R}}}{{\gamma - 1}}$$
D. Both (B) and (C)
Answer: Option D

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