GCSE Physics (AQA)

346 videos | 23 hours

Perfect Black Body

Please subscribe to watch this video.

This, and all other videos, are included in our premium subscriptions.

Premium accounts get access to all videos.

Waves Black body radiation

Perfect Black Body

6:19 Infrared Radiation and Black Bodies
Spec 4.6.3.1
Previous Temperature & Emission Next Temperature & Absorption
  • Different objects absorb varying amounts of infrared and electromagnetic radiation.
  • Electromagnetic radiation includes waves of all wavelengths.
  • When infrared radiation is directed at objects, they can transmit, reflect, or absorb the waves.
  • A ball reflects more radiation than a rock, indicating different absorption levels.
  • A perfect black body is a theoretical object that absorbs all radiation without reflecting or transmitting any.
  • Black bodies are excellent absorbers and emitters of radiation.
  • A perfect black body cannot exist as all objects reflect or transmit some electromagnetic waves.
  • Objects modeled as black bodies absorb almost all electromagnetic radiation.
  • Stars and planets are examples of objects modeled as black bodies.
  • Modern camouflage and certain heaters, cameras, and coatings are designed to mimic black bodies.
  • Some objects are designed to be poor absorbers and emitters, like radiators and mirrors.
  • Radiators should emit heat slowly, not like a black body.
  • Mirrors need to reflect visible light, not absorb it like a black body.
  • White or shiny surfaces are used to reduce radiation absorption.
  • Understanding black bodies is important for exams and explaining object behavior.

Please subscribe to access these revision notes.

This, and all other video notes, are included in our premium subscriptions.

Premium accounts get access to all videos and revision notes.