An interstellar cloud is observed at a wavelength of 2.898 µm. Estimate the temperature of the cloud.
Q: 12) Estimate the wavelength of the radiation emitted by an interstellar cloud of 4000 K. nts)
A: Interstellar clouds are made of gas and dust particles that are left over after a star dies. When an…
Q: Problem 3: Two stars, M and N, from the same galaxy (at the same distance from earth) are observed…
A: The both stars emit same amount of energy per unit time. Luminosity is given as L=4πR2σT4, where R…
Q: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Sun (M =…
A: Luminosity can be defined as an absolute measure of radiated power emitted by a light source over…
Q: A He-Ne laser with wavelength 632.8 nm is fired from a great distance toward a neutron star with…
A: As per the general theory of relativity, gravity affects light and causes energy change in photons.…
Q: The dust in a molecular cloud has a temperature of about 34 K. At what wavelength (in nm) does it…
A: temperature = T = 34 K wavelength = λmax=?
Q: 2. Using your average Hubble's constant, calculate the age of the Universe. For this, first, we use…
A: Given: Hubble constant H=71 [km/sMparsec] According to Hubble`s law, it was found that the galaxies…
Q: the number of air density in a childs balloon is roughly the same as sea level air, 10^19 particles/…
A: Given: Here, n1 and n2 are the number densities. d1 and d2 are the diameters of the balloon.
Q: Interstellar dust is found to be at a temperature of 1000 K. At what wavelength will be the…
A: Interstellar dust is formed from dying stars. During supernova explosions, the outer layer of the…
Q: What factors resist the contraction of a cloud of interstellar matter?
A: Interstellar matter is defined as the space between the stars' systems in the galaxy. It is made…
Q: How did you go from L^3/3 to 2L/3?
A:
Q: ased on what you have learned about galaxy formation from a protogalactic cloud (and similarly star…
A: Dark matter do not emit any radiation The pressure of an ideal gas decreases when temperature drops…
Q: In which portion of the spectrum is the core of the galaxy invisible? a. infrared b. visible…
A: In gamma ray the core of the galaxy invisible
Q: Consider hot Jupiter with a temperature of 3138 K orbiting the star Vega at what wavelength in nm…
A: given- Temperature of jupiter =3138 K
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: Consider a star for which the stellar power per unit area at distance 1 AU from the star is 4.5…
A: Intensity at a distance is Radius of star is Note:The Stefan Boltzmann constant is Find:Surface…
Q: What is the peak wavelength (in nm) of a neutron star's luminosity if its temperature is 106 K?
A: As we know that Using weins displacement law,λmax T = b -----(1).where b is a constant. known as…
Q: 서양의 단위는 요을 사용한다. A conducting wire with a uniform radius of 0.40 cm and a length of 3.2 m is…
A: Given: radius r=0.40 cm length l= 3.2 m voltage V= 12 v current I=0.40 A
Q: The dust in a molecular cloud has a temperature of about 50 K. At what wavelength does it emit the…
A: A blackbody is an ideal object that absorbs all the radiation that falls on it. The blackbody then…
Q: Using Wien's law, what is the wavelength (in nanometers) of the peak of the spectrum of a star which…
A: Solution:-Given thatSurface Temperature (Ts)=2.9×104 K
Q: like a black body with temperature 5800 K. Use the Stefan-Boltzmann Law to calculate the Sun's…
A: Given: Sun's Radius (R) = 6.96 x 1010 cm Stefan-Boltzmann Constant (σ)=5.67 x 10-5 ergs/cm2 K4 s…
Q: What is the wavelength of maximum intensity (in nm) and the total energy emitted (in J/s/m2) by a…
A: The temperature of the celestial body is given to be 7K. In case of a celestial body which we…
Q: Plot the spectral emittance the five bodies in our solar system Listed here: Sun (6000 K) Venus (600…
A: The spectral emittance of a body is given by : Bλ(λ,T)=2hc2λ51ehc/λkT−1Here, h is the planck's…
Q: The above spectrum is most plausibly produced by which kind of object? Select one alternative:
A: Required : Correct choice.
Q: Given a low density cloud of Hydrogen atoms, what happens when the temperature of the cloud is…
A:
Q: Using Wien's Law for two black body objects with a temperature of 1000 K (fire) and 290 K…
A:
Q: NGC 3379 is an El galaxy at a distance of 14.8 Mpc that has an apparent B band magnitude of 10.65…
A: Given: M87 central velocity dispersion of 315 km s-1 and an apparent B-band magnitude of 10.1. To…
Q: 6 Which of the following methods has led to the most discoveries of massive planet A B с D Detecting…
A: 16. Solution: The most successful method of detection of the planet is the radial velocity method…
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- Physics astronomyThe fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth suggests that a. they are formed by material falling into the galaxy. b. they are powered by black body radiation. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets of high-speed matter in magnetic fields, which tend to emit photons in the direction they are moving.1. Spectral signatures can be described using luminosity values in different spectral regions. UV Blue Green Red NIR Forest 28 29 36 27 56 Water 22 23 19 13 8 Corn 53 58 59 60 71 Pasture 40 39 42 32 62 Assuming these signatures are influenced by atmospheric effects: is it possible to separate the different categories based on the values in this table? Which band (s) are the most useful for distinguishing between the different classes in this table and why?
- Q3.2 The supergiant star has a surface temperature of about 2900 K and emits a power of approximately 4 x 1030 W. Assuming that is a perfect emitter and spherical, find its radius. (hint: Area of the sphere is A = 4πr²)Infrared radiation from the center of our galaxy with a wavelength of about 2 μm (2 × 10-6 m) comes mainly from cool stars. Use this wavelength as Amax and find the temperature of the stars.[6/2, 7:18 AM] Ali Diaa: Telescopes are an essential tool for astronomers to study the universe. You plan to build yourown telescope that can resolve the Great Red Spot on the surface of Jupiter at a wavelength of600 nm. The farthest distance between the Earth and Jupiter is 968 × 106 km and the Great RedSpot has currently a diameter of 16,500 km.(a) Use the Rayleigh criterion to determine the diameter of the lens’ aperture of your telescopethat is needed to resolve the Great Red Spot on Jupiter.[6/2, 7:44 AM] Ali Diaa: Scientists are developing a new space cannon to shoot objects from the surface of the Earth directly into a low orbit around the Earth. For testing purposes, a projectile is fired with an initialvelocity of 2.8 km/s vertically into the sky.Calculate the height that the projectile reaches, ...(a) assuming a constant gravitational deceleration of 9.81 m/s2.(b) considering the change of the gravitational force with height.Note: Neglect the air resistance for this problem.…
- Construct Your Own Problem Consider a star moving in a circular orbit at the edge of a galaxy. Construct a problem in which you calculate the mass of that galaxy in kg and in multiples of the solar mass based on the velocity of the star and its distance from the center of the galaxy.11. Bob is traveling in a space ship and observes emission from a cloud of atomic hydrogen gas a few light years away. He identifies the Balmer-beta emission line (from the n = 4 to n = 2 transition) and measures its wavelength to be 322 nm. How fast is Bob moving relative to the cloud of hydrogen? Is he getting closer or further away from the hydrogen cloud? (You may assume that Bob is moving directly toward or away from the hydrogen gas cloud. Recall that the ground state energy of hydrogen is -13.6 eV.)Can you suggest a possible origin for the helium gas that is part of the Earth's atmosphere?
- 3 A galaxy has a visible mass of 10 Mo and a flat rotation curve extending to 25 kpc at the level of 150 km s. What is the ratio of its dark-matter mass to its visible mass?Quasi-stellar objects were first detected as a. double-lobed spiral galaxies. b. faint points of light with peculiar emission spectra. c. large regions of X-ray emissions. d. starlike objects with normal stellar emission spectra. e. galaxies with normal stellar emission spectra.The spectral energy distribution of the sum has a maximum at 4650 Aº. It temperature of sum is 6000°K, what is the temperature of the star for which this maximum is 9402 A°.