Question

energy in the universe quick check
which of these tasks is completed with infrared radiation? (1 point)
○ diagnosing a broken bone or decayed tooth
○ transmitting digital messages with a cell phone
○ sending messages through fiber optic cables
○ removing bacteria from the air in hospitals

Explanation:

• Diagnosing broken bones/decayed teeth uses X - rays, not infrared.
• Cell phones use radio waves (a type of electromagnetic radiation, but not infrared) for digital message transmission.
• Fiber optic cables use light (usually visible or near - infrared in some cases, but the main task of sending messages through them is via light signals, and infrared can be used here for some applications related to data transmission in fiber optics? Wait, no, actually, fiber optics typically use visible or near - infrared light for communication. But among the given options, let's re - evaluate:
• Removing bacteria from air in hospitals: Some hospital air purification systems use ultraviolet radiation, not infrared. Wait, maybe I made a mistake. Wait, infrared radiation is used in some thermal imaging or heating, but among the options, the most appropriate (maybe the question has a typo or I misremember) but let's check again. Wait, maybe the correct option is "removing bacteria from the air in hospitals" is wrong. Wait, no, let's think about each option:

1. Diagnosing broken bone/decayed tooth: X - ray (ionizing radiation), so no.
2. Transmitting digital messages with cell phone: Radio waves (non - ionizing, in the microwave/radio range), not infrared.
3. Sending messages through fiber optic cables: Fiber optics use light (including infrared in some cases for data transmission, as infrared light can be used to carry data in optical fibers).
4. Removing bacteria from air in hospitals: UV is used for sterilization, not infrared.

Wait, maybe the intended answer is "removing bacteria from the air in hospitals" is incorrect, and the correct one is "sending messages through fiber optic cables"? Or maybe I got it wrong. Wait, no, let's check the properties of infrared. Infrared is used in remote controls, thermal imaging, and also in some fiber optic communications (as infrared light has less attenuation in optical fibers). So among the options, "sending messages through fiber optic cables" can be done with infrared radiation (as a type of light signal in the fiber). The other options:

• X - rays for diagnosis, radio waves for cell phones, UV for bacteria removal. So the correct option is "sending messages through fiber optic cables"? Wait, but maybe the question has a different intended answer. Wait, maybe the option "removing bacteria from the air in hospitals" is wrong, and the correct one is the third option: "sending messages through fiber optic cables".

Answer:

The correct option is: sending messages through fiber optic cables (the third option among the given choices, i.e., the option with the text "sending messages through fiber optic cables").