THE MASS OF A STELLAR BLACK HOLE Andrea Massi
... Doppler discovered that sound waves from a moving source are compressed or expanded, i.e. their frequency changes. For example the Doppler effect causes a siren to sound higher when it is approaching us and lower when it is receding. ...
... Doppler discovered that sound waves from a moving source are compressed or expanded, i.e. their frequency changes. For example the Doppler effect causes a siren to sound higher when it is approaching us and lower when it is receding. ...
What is light?
... Light comes from the acceleration of charged particles (such as electrons and protons) ...
... Light comes from the acceleration of charged particles (such as electrons and protons) ...
9. Entropy 2nd and 3rd laws/ Thermodynamic processes / Droplet
... (2pts) 2. Assume that all water has evaporated and that the temperature for the whole atmosphere is constant at 5◦ C. If all water vapour condenses out, what would be the increase in air temperature? Use the total mass of the atmosphere is 5 · 1018 kg. (2pts) 3. Explain different types (condensation ...
... (2pts) 2. Assume that all water has evaporated and that the temperature for the whole atmosphere is constant at 5◦ C. If all water vapour condenses out, what would be the increase in air temperature? Use the total mass of the atmosphere is 5 · 1018 kg. (2pts) 3. Explain different types (condensation ...
Homeostasis in digestive and excretory systems
... what the urinary (excretory) system does. Therefore, homeostasis is managed; the body’s nutrient absorption and elimination of chemical wastes occurs leaving the body in balance. ...
... what the urinary (excretory) system does. Therefore, homeostasis is managed; the body’s nutrient absorption and elimination of chemical wastes occurs leaving the body in balance. ...
Quiz on Chapter 11
... 11-26. A friend takes a ride on a spaceship to a distant star and returns to Earth. You and your friend were the same age when your friend left on the spaceship. When your friend returns she a) will be the same age as you. b) will be younger than you. X c) will be older than you. d) could be older o ...
... 11-26. A friend takes a ride on a spaceship to a distant star and returns to Earth. You and your friend were the same age when your friend left on the spaceship. When your friend returns she a) will be the same age as you. b) will be younger than you. X c) will be older than you. d) could be older o ...
Temperatures of Stars
... (and through a vacuum): measure the spectrum, and find the value of T that ...
... (and through a vacuum): measure the spectrum, and find the value of T that ...
Stellar Temperature and Luminosity Stellar Temperatures and
... by one square meter of the surface of the emitting object, the Sun in this setting. Recall that “energy per second” is “power,” measured in watts, W. MW indicates “megawatts.” 1MW = 1Million Watts. Thus the vertical units are MW/m2. Note that the only values on the graph are 0 and 100. You can use t ...
... by one square meter of the surface of the emitting object, the Sun in this setting. Recall that “energy per second” is “power,” measured in watts, W. MW indicates “megawatts.” 1MW = 1Million Watts. Thus the vertical units are MW/m2. Note that the only values on the graph are 0 and 100. You can use t ...
Black Holes Essay Research Paper Stars can
... its Schwarzchild radius it is said to have passed its event horizon as no outside observations can be made into it. The photon-sphere however is the point when light is forced to orbit the star, but is not pulled into the event horizon. The point at which the star s mass is centered is called singu ...
... its Schwarzchild radius it is said to have passed its event horizon as no outside observations can be made into it. The photon-sphere however is the point when light is forced to orbit the star, but is not pulled into the event horizon. The point at which the star s mass is centered is called singu ...
Starlight and Atoms - School District of Clayton
... 19. Suppose that you take the spectrum of several stars and identify the 656-nanometer line of hydrogen. You then measure against the reference spectrum on the same image and find that some of the 656-nm lines are shifted due to the Doppler Effect. Of the following shifted locations of this line, wh ...
... 19. Suppose that you take the spectrum of several stars and identify the 656-nanometer line of hydrogen. You then measure against the reference spectrum on the same image and find that some of the 656-nm lines are shifted due to the Doppler Effect. Of the following shifted locations of this line, wh ...
http://www
... examining their UV spectrum. Actually the spectra of other electromagnetic waves apart from UV are also analyzed, but it is performed by analysing the UV spectra that enables us most effectively to tell the relative composition of different elements in the atmosphere of a particular star. This is h ...
... examining their UV spectrum. Actually the spectra of other electromagnetic waves apart from UV are also analyzed, but it is performed by analysing the UV spectra that enables us most effectively to tell the relative composition of different elements in the atmosphere of a particular star. This is h ...
Black body
A black body (also blackbody) is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. A white body is one with a ""rough surface [that] reflects all incident rays completely and uniformly in all directions.""A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic radiation called black-body radiation. The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the temperature alone (see figure at right), not by the body's shape or composition.A black body in thermal equilibrium has two notable properties:It is an ideal emitter: at every frequency, it emits as much energy as – or more energy than – any other body at the same temperature.It is a diffuse emitter: the energy is radiated isotropically, independent of direction.An approximate realization of a black surface is a hole in the wall of a large enclosure (see below). Any light entering the hole is reflected indefinitely or absorbed inside and is unlikely to re-emerge, making the hole a nearly perfect absorber. The radiation confined in such an enclosure may or may not be in thermal equilibrium, depending upon the nature of the walls and the other contents of the enclosure.Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0. A source with lower emissivity independent of frequency often is referred to as a gray body.Construction of black bodies with emissivity as close to one as possible remains a topic of current interest.In astronomy, the radiation from stars and planets is sometimes characterized in terms of an effective temperature, the temperature of a black body that would emit the same total flux of electromagnetic energy.