The fact that gamma-ray bursts are so distant means that they must be very energetic events. (T/F)
Q: Calculate the gravitational redshift of radiation of wavelength 550 nm (the middle of the visible…
A: The gravitational redshift is given by the formula, z=11-2GMc2r-1 where, G is the gravitational…
Q: Taking the distance to the Crab pulsar to be 2000 pc and the bolometric magnitude at maximum…
A: The Crab Pulsar is described as a young neutron star. The star is the central star in the Crab…
Q: Life on Earth wouldn't be possible without supernovae. Why?
A:
Q: star with mass m, period Ti = 30 days, and radius ri = 1E4 km collapses into a neutron star (Links…
A: Given that The initial radius of the stat ri = 1.0×104Km and Time…
Q: to what density must the matter of a 20M☉ star be compressed in order for the star to dissapear…
A: Given Data The mass of the matter is:M=20Mo The mass of the sun is:Mo=1.99×1030 kg To find: The…
Q: How can a black hole emit X-rays?
A: Black holes are regions of high gravity in spacetime. Once a black hole is formed it will start…
Q: The expanding bubble of hot gas shown in the figure, which has been inflated by the light from a…
A:
Q: Why is it possible for repeated nova explosions to occur in the same binary system?
A: A binary star system is one in which two stars are bound to each other through gravity. They will…
Q: What is the escape velocity Vesc of a 1.4M⊙ neutron star if its radius is 12 km? Express your answer…
A:
Q: Consider a crystal containing N identical atoms. As a crude approximation, assume that each atom is…
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Q: What is the heaviest element likely to be produced in fusion processes in stars?
A: iron is the heaviest element stars can make.
Q: A nova is an event, not a stellar object. (True or false)
A: It is True. A nova is a transient astronomical event that causes the sudden appearance of a bright,…
Q: An AGN is emitting with a luminosity of 2×1040W. The AGN's brightness varies by 10% on a time scale…
A: GivenAn AGN is emitting with a luminosity of 2×1040W. The AGN's brightness varies by 10% on a time…
Q: e la supernova?
A: To trigger a type la supernova one of the two stars must be a white dwarf . The other star is often…
Q: Although visible light cannot escape from a black hole, high- energy radiation, like gamma rays,…
A: Black holes are formed when massive stars collapse under its own gravity. The gravity of a black…
Q: Calculate the total energy output per second in watts (W) of a star that converts 900 million tonnes…
A: To calculate the energy output per second in watts (W) of a star that converts 900 million tonnes of…
Q: when seeing an object at large distance
A: Given as, Eα1at
Q: (a) Calculate the photon capture radius and the Schwarzschild radius of M87* (in AU). (b) Why was it…
A: Schwarzschild radius is given by the formulars=2GMc2G is the universal gravitation constant,…
Q: The highest-velocity stars an astronomer might observe have velocities of about 400 km/s. What…
A: The radial velocity formulae is
Q: What is thought to cause the higher-energy gamma-ray bursts, which do not appear to repeat?
A: Gamma rays are short wavelength electromagnetic spectrum. The gamma-ray photons are the most…
Q: The heavier an atomic nucleus gets, the less energy the star is able to extract from it through…
A: We know the star extract energy from nuclear fusion in their core. This nuclear fusion reaction…
Q: Equate the given expressions for pressure to find an expression for the maximum mass of a star. Find…
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Q: Calculate the Eddington limit for star of 10³0 Msun.
A: In a star, the radiation pressure is constantly pushing away matter while gravity is pulling it in.…
Q: When two stars are in the same star system, they can affect each other’s evolution. Two stars in the…
A: Two stars in the same system might evolve at a different pace, depending on their distances in the…
Q: radio lines of neutral Hydrogen (apart from H91α) What does H91α meaning for?
A: Introduction: The Balmer series is the name given to a series of spectral emission lines of the…
Q: Convert the average mass density in gm/cm-3 of a M = 0.5 Msun R = 0.015 Rsun white dwarf to the…
A: Given that For white dwarf star given that M = 0.5 Msun R = 0.015 Rsun We know that mass of sun…
Q: If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength…
A: Concept: "The Wien's displacement law states that the wavelength carrying maximum energy is…
Q: Vega has Mv = 0.5. How large is Mbol? Calculate the luminosity of Vega. Remember that Mbolo = 4.75.…
A: Given information": The absolute visible magnitude of Vega (Mv) = 0.5 The Spectral class of Vega is…
Q: The exponential drop in the brightness of supernova 1987A was due to the decay of 56Ni (t1/2 = 6.1…
A: Given: The reaction of decay is given as, Ni56t1/2=6.1 days→Co56t1/2=77.1 days→Fe56
Q: 3000 cm source with luminosity at 13.6 eV of L13.GeV = 2.18 x 109 erg s- at the centre. cloud of…
A: We can estimate the size of the HII region by calculating the stromgren radius Now nH is the cloud…
Q: Calculate the redshift caused by a neutron star with a radius of 11 km and mass of 5.2 x 1030 kg.
A: As per general relativity when a photon leaves a gravitational well its wavelength will increase…
Q: Why do you expect neutron stars to spin rapidly?
A: Neutron stars are formed when stars with 4 to 8 solar mass die. When such a star runs out of fuel…
Q: Where do the γ bursts come from?
A: Gamma-ray bursts are one of the top unsolved mysteries in astrophysics, alongside such burning…
Q: The time it would take for the Sun to consume all its hydrogen (if the Sun's luminosity remained…
A: All-stars like our Sun are powered by nuclear fusion. It is a nuclear reaction in which two lighter…
Q: Type 1a supernovae are not: The result of exceeding the Chandrasehkar limit. Produced…
A: Required :: Type 1a supernovae are not:
Q: II. You have been hired as a space weather forecaster. At 11:30:00 UT on your first day, November…
A: The distance from earth to sun is = 149.6 x 106 km
Q: (a) Using Einstein's famous equation for rest-mass energy, E = mc², undergoing nuclear energy that…
A:
Q: If Betelgeuse is a M2 type star, what is the approximate temperature of the star in K?
A: Introduction - It is a supergiant star and the distance of this star from the sun is approximately…
Q: Vega Star of radius (1.6832) million km emit a) thermal radiation as a black body radiation at…
A:
Q: . Find the values of R1, R2 and R3 so that the voltage drop across R4 is 1.5V. Express your answer…
A: This is a DC circuit given. The combination of resistances are given in the circuit. We apply Ohm's…
Q: Neutrinos have never been detected experimentally. (T/F)
A: Neutrinos are chargeless particles of very tiny mass which cannot be measured. Since they have very…
Q: As a mass m of gas falls into a black hole, at most 0.1mc2 is likely to emerge as radiation; the…
A:
Q: Use the small-angle formula to find the linear diameter of a radio source with an angular diameter…
A: Given :- angular diameter of radio source = 0.0024 arc seconds. distance = 2.30 Mpc .
Q: Chart the evolutionary process of a high mass star on the H–R diagram from ZAMS to death.
A: Required to draw: The evolution of high mass stars from Zero Age Main Sequence (ZAMS) to Death: We…
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