Absorbing radiation (Infrared and black body)

• What happens to an object when it absorbs electromagnetic radiation?


  It gets warmer.
• What occurs when an object emits electromagnetic radiation?


  It cools down.
• How does the balance between absorbing and emitting radiation affect an object's temperature?


  It determines whether the object gains or loses energy.
• What happens to a hotter object like a cup of tea in relation to its surroundings?

  It emits more radiation than it absorbs, losing energy and cooling down.
• What occurs with a cooler object like an ice cube in relation to its surroundings?


  It absorbs more energy than it emits, warming up slowly.
• What is the result when an object absorbs and emits the same amount of energy?


  It stays at the same temperature.
• What does the term intensity refer to in the context of electromagnetic radiation?


  It is the power of the radiation per unit area.
• How can intensity be graphically represented?


  By plotting wavelength on the x-axis and intensity on the y-axis.
• What types of electromagnetic radiation are primarily considered in this topic?


  Ultraviolet radiation, visible light, and infrared radiation.
• How does the emitted radiation curve differ for a room temperature object like a paper bag compared to a hotter object like burning coal?


  The curve for the paper bag is lower and mostly in the infrared range, while the coal's curve is higher and shifted to the left.
• What happens to the intensity of emitted wavelengths as the temperature of an object increases?


  The intensity of every emitted wavelength increases.
• Why do bunsen burner flames change color as they get hotter?


  Because the hotter the flame, the shorter the wavelengths of light emitted.
• What type of radiation do objects at room temperature primarily emit?

  Infrared radiation.
• How does the Earth interact with electromagnetic radiation from the sun?


  It absorbs more energy during the day than it emits, increasing local temperature.
• What happens to the Earth's temperature at night in relation to radiation?


  Less energy is absorbed than emitted, causing local temperature to decrease.
• Why does the overall temperature of the Earth stay relatively constant?


  Because some parts of the Earth are always in the sun.
• What are the key concepts related to the absorption and emission of electromagnetic radiation?


  • Absorption increases temperature.
  • Emission decreases temperature.
  • Balance affects energy gain/loss.
  • Intensity is power per unit area.
  • Temperature affects emitted radiation intensity and wavelength.