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In general, an IR detector will respond to?

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In general, an IR detector will respond to?

(a) Irradiance

(b) Rotational fluid

(c) Rotational force

(d) RCS

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This intriguing question originated from Configuration Layout Considerations in section Configuration Layout Considerations of Aircraft Design

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The correct option is (a) Irradiance

For explanation I would say: Typically, all it detector will respond to irradiance. Irradiance is area density of the power. Hence, an infrared detector will respond to the density of the radiant power. RCS is measure of radar detection.

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