7. Consider the statement “An extraterrestrial astronomer surveying our solarsystem with the Doppler technique could discover the existence of Jupiter with just a fewdays observation.” Does this statement make sense? Why or why not?
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7. Consider the statement “An extraterrestrial astronomer surveying our solar
system with the Doppler technique could discover the existence of Jupiter with just a few
days observation.” Does this statement make sense? Why or why not?
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- The sun is the only star whose size we can easily measure directly; astronomers therefore estimate the sizes of other stars using Stefan's law. The spectrum of the star Betelgeuse, plotted as a function of energy, peaks at a photon energy of 0.8 eV, while Betelgeuse is approximately 10,000 times as luminous as the sun. How does the radius of Betelgeuse compare to the sun's radius? Why is Betelgeuse called a "red supergiant"?A sphere made of an unknown metal of diameter 90cm at temp T1 kelvin radiates a certain amount of energy per second. When its temp is increased to T2 kelvin, the sphere radiates 7.4 times the energy per second. What is the ratio T1/T24. 51 Pegasi b was the first extra-solar planet found around a main sequence starother than our Sun. The star, 51 Pegasi, is very much like the Sun, and it has a luminosityL = 1.30L⊙. 51 Pegasi b has an average orbital radius of 0.0527 AU and it is tidally lockedto 51 Pegasi. Given that it thought to have a Bond albedo of 0.1, what is its “no greenhouse”temperature? Note- it is tidally locked, but you should assume the temperature of the planetis uniform due to winds transferring heat.
- 1. Solar Collector Problem: From the diameter of the sun and the earth and the mean distance of sun from earth, estimate (a) the amount of energy emitted from the sun, (b) the amount of energy received by the earth, and (c) the solar constant for a sun temperature of 5700K. If the distance of Planet-Y from the sun is 7.0 astronomical unit, estimate, (c) the solar constant for Planet-Y for a sun temperature of 5700K. (Stefan-Boltzmann constant, o = 5.67 x 10-8 W/m2-K4). Diameter of the sun = 1,392,000 km; DiaPlanet-y = 340,800 km; Mean distance of the sun from the earth = 149,600,000 km r Sun R 0₂ m Aa ||A₂ Ar Concentrator1. How did Galileo’s invention of the telescope support Copernican theory? 2. How has the changing technology increased our understanding of the universe?When the Sun becomes a red giant, it's luminosity will be 2000 times its current value. The solar flux at Earth will also increase by a factor of 2000. Neglecting the greenhouse effect, the surface temperature of the earth is determined by thermal equilibrium: the flux of radiation absorbed equals the flux of radiation emitted. This means the Earth's surface flux must also increase by a factor of 2000. If the current average surface temperature is 58 degrees F. what will the average surface temperature be when the Sun is a red giant. [Hint: use the Stefan-Boltzman's law in the form of a ratio, and remember that the temperature there is in Kelvins.]
- % Power T 53.8 T2 D= 5cm D= 7cm D = 9cm 28 50% 46 27.5 41.1 27 D= 1lem 40.6 21.9 D = 5cm 78 31.5 69 70% D= 7cm D= 9cm 30.1 67 29.8 D= 1lcm 63 28.1 е. Calculations: Determine heat exchange between two black plates Q by using: q= T1: temperature of the first black plate (K). T2: temperature of the second black plate (K). A: area of plate= 0.026 m And then plot the heat exchange between two black plates versus distance between these plates at different power: DOn one side of a diverging lens of focal length 37.1 cm, you position an object of height 2.42 cm somewhere along the principal axis. The resultant image has a height of 0.97 cm. How far from the lens is the object located? 38.9 cm 55.5 cm 88.8 cm 72.2 cmIllustiate the reflection Poinipal with the help of examples.
- Many patients get concerned when a test involves injection of a radioactive material. For example for scanning a gallbladder, a few drops of Technetium-99m isotope is used. However, it takes about 24 hours for the radiation levels to reach what we are exposed to in day-to-day activities. Below is given the relative intensity of radiation as a function of time. t(hrs) 0 3 9. R 1.000 0.891 0.708 0.562 0.447 0.355 The relative intensity is related to time by the equation R = A e^(Bt). Find the constant A by the least square method.(correct to 4 decimal places)SUPPOSE THE AMBIENT TEMPERATURE IS 20degrees CELSIUS, AND THE HOT RESERVOIR CONSISTS OF A SPHERICAL TANK WITH A RADIUS OF 4.00 m, THAT ACTS AS AN IDEAL EMITTER OF RADIATION. IF ALL THE RADIANT ENERGY EMITTED BY THE TANK COULD BE CAPTURED, WHAT IS THE AVERAGE AMOUNT OF WORK THAT COULD BE DONE EACH SECOND? ( please only answer if your 100% correct) (show work)A solar pond, 1.5 m deep, is built in Pondicherry (11°56' N). The horizontal pyranometer placed beside the pond on April 20 at 1.300 following values of global and diffuse radiation are measured by a Ia=0.210 kW/m² Calculate the variation of the solar radiation flux as it penetrates through the pond.