Discussion
Which value does the exponent in that expression take for dry air?
Answer: B
The exponent is \( R/c_p \), equal to 287 divided by 1005 or about 0.286. It is sometimes written as kappa. The ratio of specific heats gamma equals 1.4 and is related through \( R/c_p = (\gamma-1)/\gamma \), so the two are easily confused. Tracing each back to its definition prevents the confusion reliably.
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