A passive instrument performs which of the following tasks?

Responses

collects radiation reflected from Earth
collects radiation reflected from Earth

records echo results from signals
records echo results from signals

accepts transmissions from Earth
accepts transmissions from Earth

sends transmissions to Earth

1 answer

A passive instrument primarily collects radiation reflected from Earth. Unlike active instruments, which send out their own signals and measure echoes, passive instruments detect natural radiation, such as sunlight that is reflected off the Earth's surface.