An emergency locator transmitter activation is described as requiring subjection to a force of prescribed intensity and duration. Which option best describes this condition?

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The thing being tested is the crash-activated feature of an emergency locator transmitter. ELTs are designed to go on automatically when the unit is subjected to a specific level of deceleration (a force of prescribed intensity) that lasts for a short duration. This inertia-based trigger ensures the transmitter activates in a real crash, not from minor bumps or normal flight vibrations.

So the description “subjection to a force of prescribed intensity and duration” matches the automatic crash activation mechanism. Manual triggering by the crew, altitude changes, or a ground electrical command aren’t describing this sensor-based activation.