1.

Which of the following expression is correct for radiation efficiency?

A. \(\eta_r = \frac{P_r}{P_l}\)
B. \(\eta_r = \frac{P_r}{P_r-P_l}\)
C. \(\eta_r = \frac{P_r}{P_r+P_l}\)
D. \(\eta_r = \frac{P_l}{P_r+P_l}\)
Answer» D. \(\eta_r = \frac{P_l}{P_r+P_l}\)


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