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A pulsar is a rapidly spinning remnant of a supernova. It rotates on its axis, sweeping hydrogen along with it so that hydrogen on one side moves toward us as fast as 50.0 km/s, while that on the other side moves away as fast as 50.0 km/s. This means that the EM
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- Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.arrow_forwardQuasars are recent additions to our body of knowledge about the physical universe. Quasars (quasi-stellar objects) are astronomical objects that are star like in appearance and emit non- thermal radiation, usually more ultraviolet and infrared radiation than stars. a Quasars were first discovered in the early 1960s when telescopes picked up mysterious radio- wave emission sources that, at the time, could not be explained. Since then, thousands of radio- emitting and radio-quiet quasars have been located. One interesting feature of quasars is that their energy output can change by great amounts in a short period of time. To date, scientists have not been able to account for these energy changes. 35. What belief does the information in the passage support? 0T 8eel .8 A. We really know nothing about our physical universe.omalab B. Scientists hold the key to all knowledge about outer space. halo C. Scientists are baffled by new discoveries in outer space. agiile D. We often make…arrow_forwardYour research team analysis the light of a mysterious object in space. By using a spectrometer,you can observe the following spectrum of the object. The Hα line peak is clearly visible at 800nm The object is travelling at a velocity of 6.67*107 m/s away from us. and is at aa distance of 894.31 Mpc What possible type of object is your team observing?arrow_forward
- Suppose a proton is moving at 1.25 % of the speed of light. a)Calculate the wavelength, in meters, of a photon that has the same momentum as this proton. b) What is the energy of the photon, in megaelectron volts? c) What is the kinetic energy of the proton, in megaelectron volts?arrow_forwardIn a parallel universe you conduct an experiment. It is determined that a duck is somewhere within a 100 m wide pond. | If Planck's constant is 2.0J-s in this universe, what is the minimum a. uncertainty you could have in measuring the momentum of the duck? b. If red light of wavelength 500 nm has an energy of 5 x 1025 eV in this universe, then what is the speed of light in this universe? Show transcribed image text In a parallel universe you conduct an experiment. It is determined that a duck is somewhere within a loo m wide pond. a. If Planck?s constant is 2.0 j s in this universe, what is the minimum uncertainty you could have in measuring the momentum of the duck? b. If red light of wavelength 500 nm has an energy of 5x 10^25 eV in this universe, then what is the speed of light in this universe?arrow_forwardAn astronomer observes the spectrum of a distant star and notices that the Hydrogen alpha absorption line appears with a wavelength of 590.4 nm. This spectral line has a wavelength of 656 nm when measured in the laboratory. Choose the option below that most plausibly explains this observation. Select one: а. Some intervening material must be imposing an unusual absorption spectrum on the star's continuum radiation O b. The star is moving towards the observer with a speed of 10% of the speed of light. О с. The star is moving away from the observer with a speed of 10% of the speed of light O d. The star is moving towards the observer with a speed 10 m/s O e. The star has a very hot atmosphere е. that changes the wavelengths of the spectral linesarrow_forward
- What is the wavelength of peak emission for a black body at 37°C? (c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m · K, o = 5.67 × 10-8 w/m2 .K4) 29 μη Ο 7.8 μη O 9.4 um Ο 94 μη 78 μηarrow_forwardA log in the fire is glowing red (λ = 629 nm). What is the temperature of the log, in kelvin?arrow_forward18. A particle of mass M at rest decays into two particles of masses m and m₂ having non-zero velocities. The ratio of the de-Broglie wavelengths of the particles 2₁/λ₂ is (a) m₁ / m₂ (b) m₂/m₁ (c) 1 (d) √m₂/√m₁arrow_forward
- The elliptical galaxy NGC 4889 is the largest galaxy in the Coma Cluster (shown in the image below taken by the Hubble Space Telescope). After analyzing the spectrum of NGC 4889, an astronomer identifies a spectral line as being CaII (singly ionized Calcium) with a measured wavelength of 401.8 nm. The true, rest wavelength of this spectral line, measured in a lab, is 393.3 nm. a) What would be this galaxy’s recessional velocity, in km/s? b) Using a Hubble constant of ?0 = 70 km/s/Mpc, find the distance to this galaxy cluster. Give your answer in megaparsecs and in light-years. c) How would your answer to part b) differ if the Hubble constant had a smaller value? A larger value? Explain.arrow_forwardWhat will be the energy associated with a blue photon (in electronvolts, eV), if the frequency of the blue light is 650 THz (Terahertz (THz); 1 Tera = 1012)? [Hint: Use Planck's equation: E - hf to calculate the photon energy! h- Planck's constant – 6.63 x 10-34 Js = 4.14 x1015 eVs] A. 6.5 eV B. 6.5×10-3 eV C. 2.7 eV D. 2.7×10-27eV E. 2.7x107 eVarrow_forward) a) What temperature is required for a black body spectrum to peak in the X-ray band? (Assume that E = 1 keV). What is the frequency and wavelength of a 1 keV photon? b) What is one example of an astrophysical phenomenon that emits black body radiation that peaks near 1 keV? c) What temperature is required for a black body spectrum to peak in the gamma-ray band with E = 1 GeV? What is the frequency and wavelength of a 1 GeV photon? d) What is one example of an astrophysical phenomenon that emits black body radiation that peaks at 1 GeV?arrow_forward
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