If you have ever heard of the Northern Lights or ball lightning, you might know that those are types of plasmas. It takes a very special environment to keep plasmas going. They are different and unique from the other states of matter. Plasma is different from a gas, because it is made up of groups of positively and negatively charged particles. In neon gas, the electrons are all bound to the nucleus. In neon plasma, the electrons are free to move around the system.
Not until around 460 B.C., a Greek philosopher, Democritus, develop the idea of atoms. He asked this question: "If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?" Democritus thought that it ended at some point, a smallest possible bit of matter. He called these basic matter particles, atoms.
Thomas Young It is equal to the work done by a force of one newton acting through one metre. Named in honour of the English physicist James Prescott Joule, it equals 10 7 ergs, or approximately 0.7377 foot-pounds.
The shape of the curve depends only on temperature. There is a simple relationship between the Temperature (measured in Kelvins) of thermal emitters and the peak of their energy spectrum. It is known as Wien's Law:
peakT = 2.898 x 10-3 m*K This says that the wavelength (color) where the curve peaks is inversely proportional to the Temperature. As the temperature increases the peak moves to shorter wavelengths of radiation. And so we see the color of the object change as it is heated or cools. When you turn on the burner of an electric oven it starts out glowing a red color and as it heats up goes from red to orange to yellow. The burner is emitting radiation even before you first see it glow red. It starts out emitting IR radiation because it's temperature is initially around 300 K
Do you know of anything we commonly come in contact with that is a plasma?
ReplyDeleteIf you have ever heard of the Northern Lights or ball lightning, you might know that those are types of plasmas. It takes a very special environment to keep plasmas going. They are different and unique from the other states of matter. Plasma is different from a gas, because it is made up of groups of positively and negatively charged particles. In neon gas, the electrons are all bound to the nucleus. In neon plasma, the electrons are free to move around the system.
DeleteWho first found the atom and long ago was it?
ReplyDeleteNot until around 460 B.C., a Greek philosopher, Democritus, develop the idea of atoms. He asked this question: "If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?" Democritus thought that it ended at some point, a smallest possible bit of matter. He called these basic matter particles, atoms.
DeleteWhat is an example of something that has an absorption spectrum?
ReplyDeleteWhite Light
DeleteWhy is energy measured in Joules? Who discovered the concept of energy?
ReplyDelete-Emily Villarreal
Thomas Young
DeleteIt is equal to the work done by a force of one newton acting through one metre. Named in honour of the English physicist James Prescott Joule, it equals 10 7 ergs, or approximately 0.7377 foot-pounds.
Are there specific methods or tools we can use to measure and observe thermal radiation? How might this help our understanding of energy?
ReplyDeleteThe shape of the curve depends only on temperature. There is a simple relationship between the Temperature (measured in Kelvins) of thermal emitters and the peak of their energy spectrum. It is known as Wien's Law:
DeletepeakT = 2.898 x 10-3 m*K
This says that the wavelength (color) where the curve peaks is inversely proportional to the Temperature. As the temperature increases the peak moves to shorter wavelengths of radiation. And so we see the color of the object change as it is heated or cools. When you turn on the burner of an electric oven it starts out glowing a red color and as it heats up goes from red to orange to yellow. The burner is emitting radiation even before you first see it glow red. It starts out emitting IR radiation because it's temperature is initially around 300 K
peak = 2.898 x 10-3 m*K/(300 K) = 9.7 x 10-6 m
There are also diagrams that also help give a visual but these equations are the best way to understand energy.
DeleteAre there specific methods or tools we can use to measure and observe thermal radiation? How might this help our understanding of energy?
ReplyDelete