electromagnetic spectrum
... •Notice the human eye can only see a small amount of what electromagnetic radiation is all around us. •Analyzing electromagnetic radiation tells us most of what we know about the universe. ...
... •Notice the human eye can only see a small amount of what electromagnetic radiation is all around us. •Analyzing electromagnetic radiation tells us most of what we know about the universe. ...
Today`s Objectives - RanelaghALevelPhysics
... • The luminosity of a star is the total energy given out per second, so it's the power. • From the graph the luminosity increases rapidly with temperature, which gives rise to Stefan's Law. • The total energy per unit time radiated by a black body is proportional to the fourth power of its absolute ...
... • The luminosity of a star is the total energy given out per second, so it's the power. • From the graph the luminosity increases rapidly with temperature, which gives rise to Stefan's Law. • The total energy per unit time radiated by a black body is proportional to the fourth power of its absolute ...
PPT - University of Arizona
... (3) The excitation of electroms in atoms by the Boltzman distribution (4) The velocity distribution of particles by the Maxwell-Boltzman distribution ALL WITH THE SAME TEMPERATURE, T When (1)-(4) are described with a single temperature, T, then the system is said to be in THERMODYNAMIC EQUILIBRIUM. ...
... (3) The excitation of electroms in atoms by the Boltzman distribution (4) The velocity distribution of particles by the Maxwell-Boltzman distribution ALL WITH THE SAME TEMPERATURE, T When (1)-(4) are described with a single temperature, T, then the system is said to be in THERMODYNAMIC EQUILIBRIUM. ...
Lecture 32 - McMaster Physics and Astronomy
... Poynting Vector • The magnitude S represents the rate at which energy flows through a unit surface area perpendicular to the direction of the wave propagation – This is the power per unit area ...
... Poynting Vector • The magnitude S represents the rate at which energy flows through a unit surface area perpendicular to the direction of the wave propagation – This is the power per unit area ...
Lesson 7 - Blackbody Radiation and Luminosity
... metal rod and a burning match at the same temp. Which gives off more energy??? We must consider the amount of energy emitted per surface area. ENERGY FLUX ...
... metal rod and a burning match at the same temp. Which gives off more energy??? We must consider the amount of energy emitted per surface area. ENERGY FLUX ...
Faint Young Sun Paradox Part I
... Energy is transferred by electromagnetic radiation Earth ~150 million km from the sun = perfect distance Not too hot, not too cold, but why is that?? ...
... Energy is transferred by electromagnetic radiation Earth ~150 million km from the sun = perfect distance Not too hot, not too cold, but why is that?? ...
Homework #1: Due in class Thursday February 2nd
... magnetic field is strong. They are dark because the sunspot is cooler than the rest of the photosphere. Cool gases emit less thermal radiation than hot gases. Images of the Sun taken in visible light and X-rays appear very different (see e.g. the picture in the Chapter of the textbook titled `Our St ...
... magnetic field is strong. They are dark because the sunspot is cooler than the rest of the photosphere. Cool gases emit less thermal radiation than hot gases. Images of the Sun taken in visible light and X-rays appear very different (see e.g. the picture in the Chapter of the textbook titled `Our St ...
Planetary Sciences
... colors are seen at various wavelengths … what’s in the atmosphere/on surface? temperature profiles with height … where is it raining, and what is it? if Teff ≠ Tequil then you know something is fishy… ...
... colors are seen at various wavelengths … what’s in the atmosphere/on surface? temperature profiles with height … where is it raining, and what is it? if Teff ≠ Tequil then you know something is fishy… ...
ASTR2050 Spring 2005 •
... into (about) five different so-called “magnitudes”: “First magnitude” meant the brightest star observed “Sixth magnitude” meant the faintest star observed Today, we know better how to measure “brightness” but we are stuck with the ancients’ convention! ...
... into (about) five different so-called “magnitudes”: “First magnitude” meant the brightest star observed “Sixth magnitude” meant the faintest star observed Today, we know better how to measure “brightness” but we are stuck with the ancients’ convention! ...
22-3 Energy, Momentum and Radiation Pressure
... Simply shining a flashlight onto an object causes a pressure to be exerted on the object. For an ordinary flashlight, however, the pressure is so small that it is negligible. For comparison, atmospheric pressure is approximately 105 Pa. To exert that pressure with an electromagnetic wave that reflec ...
... Simply shining a flashlight onto an object causes a pressure to be exerted on the object. For an ordinary flashlight, however, the pressure is so small that it is negligible. For comparison, atmospheric pressure is approximately 105 Pa. To exert that pressure with an electromagnetic wave that reflec ...
The Sun - University of Minnesota
... just make the whole star collapse? – Gravity pulls in – Pressure from inside the sun pushes out – These two things balance perfectly ...
... just make the whole star collapse? – Gravity pulls in – Pressure from inside the sun pushes out – These two things balance perfectly ...
Radiation pressure
Radiation pressure is the pressure exerted upon any surface exposed to electromagnetic radiation. Radiation pressure implies an interaction between electromagnetic radiation and bodies of various types, including clouds of particles or gases. The interactions can be absorption, reflection, or some of both (the common case). Bodies also emit radiation and thereby experience a resulting pressure.The forces generated by radiation pressure are generally too small to be detected under everyday circumstances; however, they do play a crucial role in some settings, such as astronomy and astrodynamics. For example, had the effects of the sun's radiation pressure on the spacecraft of the Viking program been ignored, the spacecraft would have missed Mars orbit by about 15,000 kilometers.This article addresses the macroscopic aspects of radiation pressure. Detailed quantum mechanical aspects of interactions are addressed in specialized articles on the subject. The details of how photons of various wavelengths interact with atoms can be explored through links in the See also section.