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Success Criteria:
I am able to Students demonstrate an understanding of Wien's Law, including its basic premise, which relates the temperature of a blackbody object to the peak wavelength of its emitted radiation.
I am able to apply Wien's Law equation to solve problems involving the calculations of peak wavelength.
I am able to identify and explain real-world examples or applications of Wien's Law, such as the color changes in a hot object or the behavior of stars of different temperatures.
Fun Fact
The hottest star measured in our galaxy is generally considered to be O-type stars, particularly those of the O3 spectral class. These stars have surface temperatures exceeding 40,000 Kelvin. One example of such a hot star is Zeta Puppis (ζ Puppis), also known as Naos, which is estimated to have a surface temperature of around 42,000 Kelvin. It's located in the constellation Puppis and is one of the brightest stars visible in the night sky.
Key terms
Electromagnetic Radiation is emitted and absorbed from all objects who have a temperature above absolute zero. (0 Kelvin or - 273.15 degress Celcius)
Wien's Law states that the surface temperature of an object emits radiation with its maximum intensity at a “peak” wavelength.
Black-Body is an idealized object that absorbs all radiation that falls onto it and emits radiation at all wavelengths according to its temperature, without reflecting or transmitting any of the incoming radiation.
Emissivity is a measure of how efficiently an object emits thermal radiation compared to a perfect blackbody at the same temperature. It ranges from 0 to 1, where 1 indicates an ideal blackbody emitter and 0 indicates a perfect reflector.
Learning Tasks
5.1 Knowledge and Understanding questions p.131
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