How can we know that the sun will “die” in about 5 billion years? Choose the correct answer. A. We can see the evolution and death in the spectra B. We can see the entire process as it plays out in a star C. We look at thousands of stars like the sun and can see them in all stages of development
Q: 2. Explain the different mechanisms that power the internal heating of a giant star, a main sequence…
A: Question : Explain the different mechanisms that power the internal heating of a…
Q: 1. The stellar parameter that best determines a star's location on the main sequence is: Select one:…
A: 1. The stellar parameter that best determines a star's location on the main sequence is: c. mass…
Q: A star's Zero Age Main Sequence (ZAMS) radius R, luminosity L, and effective temperature Teff depend…
A: Given: Zero Age Main Sequence is beginning point of the main sequence of the star. The radius at…
Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…
A: The correct option. Following the mass transfer, which of the following is now true of the main…
Q: The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing…
A: To calculate the number of photons per second that arrive at the retina, we need to know the star's…
Q: Use t = to compute the life expectancy of a 0.9-solar-mass star. (A solar lifetime is approximately…
A:
Q: 3) A series circuit contains a resistor with R = 24 2, an inductor with L= 2H, a capacitor with C =…
A:
Q: What kind of star is most likely to become a white-dwarf supernova? A. a star like our Sun B. a…
A: There are gas and dust particles in outer space when their mass increases they will start attracting…
Q: A bright blue star is moving away from Earth. Which of the choices best completes the following…
A: A bright blue star is moving away from Earth. Answer option A Absorption ,Red shifted
Q: Our Sun is considered an "average" star. What is the average star really like? Explain. Could you go…
A: We can define an average star as: An average star, or more properly, an intermediate-mass star,…
Q: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
Q: True or False 8. Almost all stars are in binary systems. The book says: "So far you have been…
A: The statement: All stars are in binary systems. The book says: "So far you have been considering the…
Q: Why does core fusion cease when silicon forms in the core of a massive star?
A:
Q: Explain in full detail how and why medium-mass stars like the Sun evolve off the main sequence. Be…
A: Answer is explained below with proper explanation
Q: The average density of the sun is 1. 4 g/cm3 What do you expect the density to be at 0.25 of Rsun?…
A: Given: The average density of the sun is ρs = 1.4 g/cm3 The radius of the sun is R = 6.9634 x 105 km…
Q: A planetary nebula is visible due to ____.
A: The nebula is the bright area in the sky, which can be cloud of stars or gas.
Q: A neutron star is the remnant left after certain supernovae texplosions of giant stars) Typically,…
A: The density is given by ρ=Massvolume The volume of sphere is 43πR3 It is given that the mass of…
Q: 3. a) Explain how it is possible for the core of a red giant to contract at the same time that its…
A: a) The core of a red giant contracts due to depleted fuel, while nuclear fusion in surrounding…
Q: Based on what you learned about the source of stellar energy and how stars make energy, select all…
A: Solution: 1. Many stars make energy with the proton-proton cycle. True, Many, less massive stars…
Q: A planet orbits 1 AU from a star that is 2 times as massive as our Sun. How does the star's…
A: Let, The luminosity of the star = L The luminosity of the Sun = LSun The mass of the star = M The…
Q: 1. A planetary nebula has an angular diameter of 76 arc seconds and a distance of 5100 ly. What is…
A: 1.Small angle Formula:D=αd2.06×105where, D is the linear diameterα is the angular diameter=76 arc…
Q: C and D
A: The luminosity of sun is known. This is the energy released per second. We then find the number of…
Q: . Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this…
A: "Since you have posted a question with multiple sub-parts, we will solve the first three subparts…
Q: From its spectral type, the surface temperature of a main sequence star is measured to be about…
A: Using the 1r2 rule method, we can find out the star's distance by measuring the intrinsic brightness…
Q: C and D
A: We are given the luminosity of sun. This is the energy released per second by sun. We know that 4…
Q: 5. A star whose temperature is 8000 K has a peak wavelength of 362.5 nm, according to Wien's Law. If…
A: The peak wavelength by observer on earth = 362.365nm.Your required explanation is given below. Thank…
Q: Star A has a temperature of 5,000 K and Star B has temperature of 6,000 K. At what wavelengths (in…
A: Temperature of star A = 5000 k temperature of star B = 6000 k
Q: The total luminosity of the Sun is 4e26 Watts. a) What is the mass (in kg) that the Sun loses each…
A:
Q: c) The star may be assumed to evolve with effective temperature, Teff, remaining constant. Show that…
A: To start, we'll use the equation for the luminosity of a star: where L is the luminosity, R is the…
Q: Describe the reaction that powers the sun during its main sequence lifetime. Be sure to include the…
A: The sun is powered by nuclear fusion, a process in which atomic nuclei combine to form a heavier…
Q: Consideration of the total energy in a radio lobe of an AGN implies that the energy is distributed…
A: Explanation -: The scaling of the magnetic field with observed luminosity (Las) in the…
Q: Based on what you learned about stellar structure and how stars maintain their stability, select all…
A: Required : Correct statements.
Q: Based on what you know about main-sequence stars, select all of the correct statements from the…
A: Required : Correct statements .
Step by step
Solved in 2 steps
- Based on what you know about the interactions between stars and other interstellar media, select all of the correct statements from the following list. -Coronal gas is ejected from supernova explosions. -Clouds of neutral hydrogen have masses of hundreds of solar masses. -The intercloud medium is cool.Much interstellar dust comes from stellar atmospheres. -Molecular clouds are where stars are born. -Molecular clouds are of very low density; ultraviolet photons permeate the cloud to break up all molecules.Select all of the statements about the main sequence stage in the life of a star that are TRUE: All stars spend the majority of their lives in the main sequence stage. Most stars lose a significant amount of mass while they are on the Main Sequence. Different stars spend a different amounts of time (number of years) in the main sequence stage, depending on the characteristics they were born with. Main sequence stars are rare in the Galaxy, so we are lucky to be living around one. During the main sequence stage, energy to power the star is provided by the fusion of hydrogen.7. Let's characterize a typical neutron star. (a) Compute its luminosity in units of the solar luminosity. Consider that the neutron star has a surface effective temperature of 106 K and a radius of 7 km. (b) In which wavelength does the neutron star radiate most energy (in nm)? (c) In which region of the spectrum it will be easier to detect / observe such an object (look at Figure 2)? mmmmmm 0.0001 nm 0.01 nm Gamma rays 400 nm Increasing energy X-rays Increasing wavelength 10 nm 1000 nm 0.01 cm Ultra- violet Infrared Visible light 500 nm 600 nm Figure 2: Electromagnetic spectrum 1 cm 1m Radio waves Radar TV FM 700 nm 100 m AM
- Activity 8: Complete Me! Directions: Complete the given following nuclear reactions on the formation of heavier elements during star formation and evolution. Write your answers in the space given. 1. n° → p* + - + v 2. p* + n° - 12D +- 3. 23He + 12_ 24He + p* 4. 12D + 12D - 24He + 5. 137 + 12D → 24He + - 6. 12H + 12H - 24He + 7. 13H +H 24He + - 8. _- 37Li + 9. + 47B + 10 -- 67C + - Q1 Week 1 (Learning Activity Worksheet) Target Competency: Give evidence for and describe the formation of heavier elements during star formation and evolution. (S11/12PS-lla-2) Page 4 of 8Status of Sun's core and its temperature (The letters correspond to the stages in Figure 21.1.) 3. Stage A: T10 million K. Sun is in equilibrium. 4. Stage B: T 100 million K Core collapse stops. 5. Stage C: Helium flash 6. Stage D: T 100 million K. Sun is in equilibrium. 7. Stage E: T800 million K. Core collapse stops. If fusion is occurring in core or in shell around the core, mark with a ✔in the correct column. Core fusion H to He FUSION ✓ Core fusion He to C Shell fusion H to He Shell fusion He to C PRESSURE VERSUS GRAVITY CORE • REST OF THE STAR Pressure comes from electron degeneracy Pressure Gravity Gravity Pressure region contracts and heats Pressure > Gravity region expands and coolsWhich statement is most logical? a Once gravity overcomes thermal pressure, nebulae cloud turns into molecular cloud. If it is cold and dense enough, molecular cloud might turn into protostar. b If gravity is stronger than thermal pressure, nebulae cloud contracts into molecular cloud. If it is cold and dense enough, molecular cloud might turn into protostar. c If a molecular cloud is cold and dense enough, it turns into a protostar. Once gravity overcomes thermal pressure, protostar might become molecular cloud. d If a nebulae cloud is cold and dense enough, it turns into molecular cloud. If gravity is stronger than thermal pressure, molecular cloud might become protostar.
- What is fusion? How does it happen inside a star?Based on what you learned about stellar evolution, select all of the correct statements from the following list. 1. The period of some Cepheid variables actually changes. 2. When getting dimmer, variable stars are releasing energy; when getting brighter they are storing energy. 3. variable stars are expanding and contracting 4. despite their variability, variable stars stay in a specific position on the H-R diagram. 5. A changing period in a Cepheid variable means that the size of the star is changing and that the star is therefore evolving. 6. Only stars on the instability strip are variable. 7. More massive stars will vary their brightness more quickly.Read each question carefully and choose the letter of the best answer. Use the following choices to answer questions 1-3. a. nebula nucleosynthesis b. supernova nucleosynthesis c. stellar nucleosynthesis d. big bang nucleosynthesis 1. Which process is probable to produce the heaviest element? 2. When are hydrogen and helium formed? 3. When are carbon and oxygen formed? 4. What elements will be produced when carbon undergoes fusion reactions? a. hydrogen and helium b. beryllium and hydrogen C. oxygen and neon d. xenon and gold 5. When does a massive star enter the stage of becoming a supernova? a. when the star has used up all its hydrogen fuel b. when the star has burned all its oxygen C. when the chromium fusion stop 6. Which of the following describes stellar nucleosynthesis? a. It is the formation of light elements such as hydrogen and helium. b. It is the process by which elements are produced in gas clouds. c. It is the formation of elements during a supernova explosion. d. It is…
- Place the following events in the formation of stars in the proper chronological sequence, with the oldest first and the youngest last. w. the gas and dust in the nebula flatten to a disk shape due to gravity and a steadily increasing rate of angular rotation x. a star emerges when the mass is great enough and the temperature is high enough to trigger thermonuclear fusion in the core y. the rotation of the nebular cloud increases as gas and dust concentrates by gravity within the growing protostar in the center z. some force, perhaps from a nearby supernova, imparts a rotation to a nebular cloud y, then z, then w, then x z, then y, then w, then x w, then y, then z, then x z, then x, then w, then y x, then z, then y, then w MacBook Air on .H. O O O O1Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD... A) On the main sequence, more massive stars are colder. B) High mass stars are the most numerous type of stars observed in the galaxy. C) Giants are colder than main sequence stars at the same luminosity. D) Giants are brighter than dwarfs at the same temperature. E) On the main sequence, more massive stars are dimmer. F) White dwarf stars are much denser than main sequence stars. Hint: White dwarf stars have about the mass of our sun, but are only the size of the Earth. Therefore, they have a very high density.