The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the redshift of this quasar? a. 5 b. 0.5 c. 0.25 d. 4 e. 1944.4
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| a. |
5
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| b. |
0.5
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| c. |
0.25
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| d. |
4
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| e. |
1944.4
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- 2. An astronaut measures the distance between two stars as being 14.7 light-year and she measures the time it takes to travel between the stars as 21.0 years. a. Identify whether the astronaut or an observer on one of the stars would measure the following 4 properties. Proper Distance Proper Time b. How fast is the astronaut travelling? Dilated Time c. What is the proper distance (length) between the stars? d. What is the contracted distance (length) between the stars? Contracted Length e. What is the proper time between leaving one star and arriving at the other star? f. What is the dilated time between leaving one star and arriving at the other star?Answer question 22 please2. Determine the Schwarzschild radius and the average density of a black hole formed by the gravitational collapse of the Sun (m = 1.99 × 10 kg). 30 ad by the gravitational
- A particle has a mass of 6.4E-27kg and a momentum of 3.5E-18 kg.m/s. Determine the energy of that particle in GeV (1GeV=1E9 eV). Keep three significant digits.The red-shift of a galaxy observed by us corresponds to a speed of 50000 km/s. How far is the galaxy from us approximately? A. 700 Mpc B. 70 Mpc C. 7 Mpc D. 7 Gpc Is the answer A? Thank you!4. Black holes are theorized to form from (HS-ESS1-3) a. very massive planets that collide with very large stars, resulting in an excessive amount of matter This matter collapses onto itself, extinguishing the star and resulting in the black hole b. very massive stars when their core nuclear fuel has essentially expired, resulting in the core collapsing in on itself. This is due to gravitational forces that act without nuclear fusion counteracting them C. very small stars when their outer shell nuclear fuel expires, leaving the dense core to collapse in on itself. This results in massive gravitational forces d. very young stars that do not have enough nuclear fuel to start the massive chain reactions normally produced in stars emitting large amounts of electromagnetic energy 5. What evidence helps supports the idea of the Big Bang Thoery (HS-ESS1-2) a. Earth Soil Samples b. Neil DeGrass Tyson c. Apparent motion of planets d. Red shift of distant light
- Name: Hubble Distances Redshift z parameter The relativistic redshift is parametrized by z and given by Δ In terms of the scale factor, 2= X do - de de 1+z= ao a (2) Problem 01. Find the redshift z for a Hydrogen spectral line originally at 656 nm which has been observed at a wavelength of 1.64 μm. Astro 001 Fall 2022 Problem 02. How much smaller was the universe when this light was emitted? U₁ = DHO Using the redshift to measure the velocity, we find D~ (1) 0.1 Hubble's Law Hubble's Law states that the recession velocity of a redshifted galaxy is given by the product of the distance and the Hubble constant. (3) ZC Ho where c = 3 x 108 m/s and Ho = 2.3 x 10-18 s in standard units. The standard measurement of the Hubble constant is Ho = 71 (km/s)/Mpc. Problem 03. What is the distance in Mpc and ly to the galaxy measured in problem 01? 1 pc = 3.26 ly.The density of the universe is a. equal to the critical density if the universe is closed. b. equal to the critical density if the universe is flat. c. greater than the critical density if the universe is flat. d. greater than the critical density if the universe is open. e. none of the above.plz do both
- 2. Draw a Feynman diagram for each of the following reactions, provided it is allowed. If the reaction is forbidden explain why. μ → eveVμ τ' →μνμύτ Vμе- → Veft- Vμe+ → Vel+ Vμe+ → Vef+ Vμnμp VμP →μ+n eté → VμVμ ete- →T+T- e¯e → ee5. A stationary observer fires a laser. An observer in a space ship is moving to the left at 0.99c. What is the magnitude of the speed of light as measured by the observer in the ship ? Just don't state that it is c. Show that it is e7