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We observe a star that is dstar away. How much extinction would there need to be (i.e., what must 7 be) if we had ignored intervening dust, and concluded that it was actually 2 dstar away? Value: dstar = 913 pc Give your response to two decimal places.

We observe a star that is dstar away. How much extinction would there need to be (i.e., what must 7 be) if we had ignored intervening dust, and concluded that it was actually 2 dstar away? Value: dstar = 913 pc Give your response to two decimal places.

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For each problem, use the following values: c = 3x108 m/s mass of the sun = 1.989 x 1030 kg luminosity of the sun = 3.828 x 1026 W 1 AU = 1.496 x 1011 m 1 pc = 3.262 light years = 3.086 x 1016 m 1 year=3.154x107 seconds Critical density of our Universe (expressed as a mass density): Pcrit =8.7 x 10-27 kg m-³ Critical energy density of our Universe: Ecrit = Pcrit c² G=6.674 × 10-11 m³.kg-1.s-2 1 eV = 1.60218 x10-19. Boltzmann constant: kg = 1.381 x 10-23 JK-18.617 × 10-5eV K-1 energy density constant (in Stefan Boltzmann Law): a = 7.566 x 10-16 Jm-3 K-4 -4.7 x 10-³ MeV m-3 K-4 Constant in Wein displacement law: b = 2.898 x 10-3 m K baryon-to-photon ratio, n = 6 x 10-10
Transcribed Image Text:For each problem, use the following values: c = 3x108 m/s mass of the sun = 1.989 x 1030 kg luminosity of the sun = 3.828 x 1026 W 1 AU = 1.496 x 1011 m 1 pc = 3.262 light years = 3.086 x 1016 m 1 year=3.154x107 seconds Critical density of our Universe (expressed as a mass density): Pcrit =8.7 x 10-27 kg m-³ Critical energy density of our Universe: Ecrit = Pcrit c² G=6.674 × 10-11 m³.kg-1.s-2 1 eV = 1.60218 x10-19. Boltzmann constant: kg = 1.381 x 10-23 JK-18.617 × 10-5eV K-1 energy density constant (in Stefan Boltzmann Law): a = 7.566 x 10-16 Jm-3 K-4 -4.7 x 10-³ MeV m-3 K-4 Constant in Wein displacement law: b = 2.898 x 10-3 m K baryon-to-photon ratio, n = 6 x 10-10
We observe a star that is dstar away. How much extinction would there need to be (i.e., what must 7 be) if we had ignored intervening dust, and concluded that it was actually 2* dstar away? Value: dstar = 913 pc Give your response to two decimal places.
Transcribed Image Text:We observe a star that is dstar away. How much extinction would there need to be (i.e., what must 7 be) if we had ignored intervening dust, and concluded that it was actually 2* dstar away? Value: dstar = 913 pc Give your response to two decimal places.
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