Question
Which option is a good blackbody radiator? A. A lightbulb B. A mirror C. A balloon D. A person
Answer
4.2
(253 Votes)
Llinos
Master · Tutor for 5 years
Answer
A. A lightbulb
Explanation
A blackbody is a theoretical or model body which absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. This means that it does not reflect or transmit any light. In reality, no perfect blackbody exists, but some objects are better approximations than others. A mirror is designed to reflect light, so it is not a good absorber of electromagnetic radiation. Therefore, it is not a good blackbody radiator.A balloon, typically made of materials like rubber or latex, does not absorb all incident light and is not known for its emission properties. Thus, it is not a good blackbody radiator.A person emits infrared radiation because of their body heat, but humans are not efficient emitters of radiation across the entire electromagnetic spectrum. While better than a mirror or a balloon, a person is still not a good blackbody radiator.A lightbulb, specifically the filament inside, gets very hot and emits a broad spectrum of radiation, including visible light and some infrared. While not a perfect blackbody, the filament in a lightbulb is designed to emit radiation due to its temperature and does so more effectively across a wider range of wavelengths than the other options listed.Therefore, the best option among those given is: