Physics Lab/ Radiation

black body Radiation Lab 11 Go to http//phet. colorado. edu/simulations/sims. php? sim=Blackbody_Spectrum and click on Run Now. 1) In this lab, you will use the Blackbody Spectrum role model to investigate how the spectrum of electromagnetic shaft emitted by objects is affected by the objects temperature. In this simulation, you hobo input the temperature and observe the spectrum of the radiation emitted. a) The temperature of stars in the universe varies with the type of star and the historic period of the star among other things.By looking at the shape of the spectrum of light emitted by a star, we can tell something closely its average out uprise temperature. i) If we observe a stars spectrum and go that the peak power occurs at the butt against between red and infrargond light, what is the gauge go forth temperature of the star? (in degrees C) The temperature will be 4000K which would be about 3276 degrees Celcius. ii) If we observe a stars spectrum and find that the peak power occurs at the border between blue and invisible light, what is the surface temperature of the star? in degrees C) The temperature would be about 7050 degrees Celcius. b) Light electric-light bulbs operate at 2500 degrees C. What is the wavelength at which the most power is emitted for a light bulb operating at 2500 C? The wavelength would be equal to 1000nm ii) excuse why regular incandescent bulbs bollix up a lot of energy. Be trusted to include your reasoning. The majority of the light emitted is at wavelengths that are longer than that, that are visible. So the power going into the light bulb that is producing non-visible light is wasted. It is wasting energy that way, so regular incandescent bulbs are inefficient. ) In this problem we will explore the glasshouse effect by using the babys room Effect Simulation available from http//phet. colorado. edu/simulations/sims. php? sim=The_Greenhouse_Effect a) look the simulation. unbowed or saturnine The simply eff ect of increasing the number of denigrates is to push down the bar of sun realiseed by the surface of the earth. Clouds reduce the measurement of sunniness cloaked by excogitateing cheerfulness grit away from earth. Clouds also can view infrared radiation emitted by the surface and whence send it hold to spae. True or saturnineIncreasing the assimilation of glasshouse gases, increases the amount of radiation that Earth emits to space. Earth utilise to emit the same amount of radiation it confined, but not right away. So now the radiation that used to be absorb by the earth is remitted down and absorbed by the ground. So the earth is victorious in this radiation and is warming up. Without the pr field glass and pollution humans have caused then this would not be the case and it would be in equilibrium. True or traitorously When sunlight encounters a cloud, the cloud reflects about 10% of the sunlight ski binding to space. The cloud reflects about 50% of the s unlight back to space. True or FalseWhen there is a very large concentration of babys room gases, most of the IR radiation scope space has interacted with greenhouse gas molecules on its way from the surface to space. Yes, the greenhouse gases absorb IR radiation. True or False The total amount of radiation absorbed by the Earths surface is not affected by the concentration of greenhouse gases in the halo. Sunlight and greenhouse gases are absorbed by earth. When earths atmosphere has greenhouse gases the IR radiation is emitted by the surface and absorbed and also redirected back down to the surface. So the total amount of radiation absorbed is increasing.True or False At higher temperatures, the Earths surface emits more IR radiation. Yes because if the temperature increases then the power radiated increases as well. True or False During the ice age, the amount of sunlight absorbed by the Earths surface decreased. During the ice age the ice on the earth would also reflect sunli ght back, making less sunlight absorbed by the earths surface. True or False All greenhouse gases are from anthropogenic sources (that is due to mans activities). Not true, most are of course occurring but man has increased greenhouse gasses especially the high amounts of carbon dioxide deliver nowfrom mans doing.