Final answer:
The statement about IR guided missiles not producing emissions during targeting and tracking is false, as they use passive tracking. The claim that only visible light can cause the photoelectric effect is also false, given that ultraviolet light, among others, can induce it as well.
Step-by-step explanation:
The statement that IR guided missiles do not produce emissions during targeting and tracking is false. Infrared (IR) guided missiles, also known as heat-seeking missiles, do not emit anything that the target aircraft can detect during the tracking phase. However, once the missile is launched, its engine may produce an IR signature that might be detectable by enemy sensors. These missiles employ a passive guidance system that detects and homes in on the infrared radiation naturally emitted by the target's heat source, often the engine exhaust. This technology provides a reduced warning time to aircrew since there are no emissions for sensors to pick up until the missile is very close.
As for the true or false statement about visible light and the photoelectric effect, the statement is false. The photoelectric effect can be caused by ultraviolet light and other types of electromagnetic radiation as well, not just visible light.