P1 1.1 INFRARED RADIATION
- What is infrared radiation?
- Do all objects give off infrared radiation?
- How does infrared radiation depend on the temperature of an object?
- Created by: tgillmore
- Created on: 22-02-14 17:33
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- P1 1.1 INFRARED RADIATION
- Seeing in the Dark
- We can use infrared cameras to see animals in the dark
- These cameras detect INFRARED RADIATION
- Every object EMITS infrared radiation
- We can use infrared cameras to see animals in the dark
- Electromagnetic Spectrum
- RADIO WAVES, MICROWAVES and VISIBLE LIGHT are all part of the electromagnetic spectrum
- Energy from the Sun
- The sun emits all types of electromagnetic radiation
- The earths atmosphere absorbs most of this
- This doesn't block infrared radiation
- The earths atmosphere absorbs most of this
- The sun emits all types of electromagnetic radiation
- The Greenhouse effect
- SHORT WAVELENGTH IR FROM THE SUN CAN PASS THROUGH THE GLASS TO WARM THE OBJECTS INSIDE THE GREENHOUSE
- IR FROM THESE WARM OBJECTS IS TRAPPED INSIDE BY THE GLASS BECAUSE THE OBJECTS EMIT IR OF LONGER WAVELENGTHS THAT CANT PASS THROUGH THE GLASS
- So the greenhouse stays warm
- IR FROM THESE WARM OBJECTS IS TRAPPED INSIDE BY THE GLASS BECAUSE THE OBJECTS EMIT IR OF LONGER WAVELENGTHS THAT CANT PASS THROUGH THE GLASS
- Gasses in the atmosphere such as water vapour, methane, and carbon dioxide trap IR from the Earth
- SHORT WAVELENGTH IR FROM THE SUN CAN PASS THROUGH THE GLASS TO WARM THE OBJECTS INSIDE THE GREENHOUSE
- Detecting Infrared radiation
- We can use a thermometer with a blackened bulb to detect IR
- KEY POINTS
- Infrared radiation is energy transfer by electromagnetic waves
- All objects emit infrared radiation
- The hotter an object is, the more IR it emits in a given time
- Seeing in the Dark
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