Topic 6 Black Body Radiation Flashcards
What is a perfect black body object
An object absorbs all of the radiation that hits it
no radiation is reflected or transmitted
What’s all objects emit
Electromagnetic radiation is used to energy in the thermal energy stores this radiation isn’t just the infrared part of the spectrum it covers a range of wavelength frequencies
Are blackbody radiation good emitters
Best possible emmiters of radiation
What does the intensity and distribution of wavelengths emitted depend on
The object’s temperature
What is intensity
Power per unit area
How much energy is transferred to a given area in a certain amount of time
What is the temperature of an object increases
The intensity of every emitted wavelength increases
What causes the peak wavelength to decrease
The intensity increases more rapidly for the shorter wavelength than longer wavelength
What does earths overall temperature depend on
Do you know of radiation it reflects absorbs and emits
What causes an increase in local temperature
During the day lots of radiation is transferred to the Earth from the Sun and absorbed
What causes a decrease in local temperature
At night less radiation is being absorbed that has been omitted causing a decrease
Overall why does the earths temperature remain constant
Some radiation is reflected by the atmosphere clouds and earth surface
Sun radiation is emitted
Some radiation is absorbed by the atmosphere clouds and earth surface
What will cause the overall temperature to rise until absorption and omissions are equal again
If that atmosphere is thought to have some more radiation without admitting the same amount
What will cause the overall temperature to rise until absorption and omissions are equal again
If that atmosphere is thought to have some more radiation without admitting the same amount
