Question

read the text. then answer the question.
the gases that make up the atmosphere interact with certain forms of radiation. radiation is a type of energy. radiation is all around us in the form of sunlight, microwaves, radio waves, and more. in fact, most matter gives off some form of radiation.
we can see some radiation, but most radiation is invisible. for example, the fireplace shown here is giving off visible radiation in the form of light we can see. it is also giving off invisible radiation, called infrared radiation. the person sitting nearby cannot see the infrared radiation but can feel it as heat.
based on the information above, which of the following is true? select all that apply.

• most forms of radiation can be seen with the naked eye.
• infrared radiation can sometimes be felt as heat.
• the sun releases radiation.
• only bright objects give off radiation.

Explanation:

1. For "Most forms of radiation can be seen with the naked eye": The text says "most radiation is invisible", so this is false.
2. For "Infrared radiation can sometimes be felt as heat": The text states "the person... can feel it as heat" (referring to infrared radiation), so this is true.
3. For "The sun releases radiation": The text lists "sunlight" as a form of radiation, so the sun (which emits sunlight) releases radiation, this is true.
4. For "Only bright objects give off radiation": The text says "most matter gives off some form of radiation", not just bright objects, so this is false.

Answer:

B. Infrared radiation can sometimes be felt as heat, C. The sun releases radiation