Discussion
Sensitivity of a receiver is limited chiefly by
Answer: B
Noise added before most of the gain dominates, so the first stage's noise figure sets the sensitivity and later stages contribute far less. That is why a low-noise preamplifier is placed as early as possible, and why the cascade formula weights the first stage most heavily. Audio gain merely raises both signal and noise. Detector efficiency matters at very low levels but is downstream of the limiting noise. And antenna size affects the signal delivered rather than the receiver's own noise.
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