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10 marks] Question 10 [2 2 2 2 2 The Cosmic Microwave Background (CMB) is blackbody...
Please make sure you give me the correct answer 13) The cosmic background radiation permeating the...
Please make sure you give me the correct answer
13) The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. The energy density of deep space is 4.19 x 10-8 J/cm3 a, What is the peak wavelength of this radiation? b, Assuming the energy density of space is from these photons, how many photons are there on average in each cubic centimeter of space?
9/ the 2011 Nobel Prize in Physics was awarded to 3 men who study white dwarf...
9/ the 2011 Nobel Prize in Physics was awarded to 3 men who study white dwarf supernova explosions, which are known as Type la supernovae. The following problem is designed to give you a feel for what they did, and the sorts of apparent brightnesses and distances they were working with. A typical Type la supernova explosion has a luminosity of 1.72 x 10^36 W. If we observe such a supernova to have an apparent brightness of 1.25 x 10^-17...
Question 4 (10 Marks) (i) You have a P-I-N photodetector that you cool to -20° C. You reverse bias it, and measure a cu...
Question 4 (10 Marks) (i) You have a P-I-N photodetector that you cool to -20° C. You reverse bias it, and measure a current (with no illumination) of 0.5 nA. It is connected to a load resistor of 100 kQ, and input amplifier. The photodetector can be assumed to be ideal in that to an each incident photon is converted into an electron-hole pair that is then collected as photocurrent. The measurement bandwidth is 100 MHz, and the average received...
1/ Sirius A has a luminosity of 9.98 x 10^27 W and a surface temperature of...
1/ Sirius A has a luminosity of 9.98 x 10^27 W and a surface temperature of about 9400K. What is its radius? A/ r = 7.56 x 10^8 m B/ r = 1.34 x 10^9 m C/ r= 1.26 x 10^13 m D/ r = 7.94 x 10^-14 m 3/ which of the following stellar properties is the most fundamental to a star’s main-sequence and post-main sequence life? A/ temperature B/ mass C/ luminosity D/ radius 4/ Stars Moppit and...
choose correct answer. no explanation needed QUESTION 10 How do astrophysicists account for neutrino emission from...
choose correct answer. no explanation needed
QUESTION 10 How do astrophysicists account for neutrino emission from the Sun? Solar flares create neutrinos with very energetic magnetic fields. Convection releases neutrinos, which random walk through the radiation zone. Fission in the Sun's core creates neutrinos when protons turn into neutrons. The annihilation of positrons and electrons in the core produces neutrinos. Fusion in the Sun's core creates neutrinos when protons turn into neutrons, QUESTION 11 How does the interstellar medium impact...
Please make sure you give me the correct answer
13) The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. The energy density of deep space is 4.19 x 10-8 J/cm3 a, What is the peak wavelength of this radiation? b, Assuming the energy density of space is from these photons, how many photons are there on average in each cubic centimeter of space?
Question 4 (10 Marks) (i) You have a P-I-N photodetector that you cool to -20° C. You reverse bias it, and measure a current (with no illumination) of 0.5 nA. It is connected to a load resistor of 100 kQ, and input amplifier. The photodetector can be assumed to be ideal in that to an each incident photon is converted into an electron-hole pair that is then collected as photocurrent. The measurement bandwidth is 100 MHz, and the average received...
choose correct answer. no explanation needed
QUESTION 10 How do astrophysicists account for neutrino emission from the Sun? Solar flares create neutrinos with very energetic magnetic fields. Convection releases neutrinos, which random walk through the radiation zone. Fission in the Sun's core creates neutrinos when protons turn into neutrons. The annihilation of positrons and electrons in the core produces neutrinos. Fusion in the Sun's core creates neutrinos when protons turn into neutrons, QUESTION 11 How does the interstellar medium impact...
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