Cosmos and Cosmogony II Cosmos and Cosmogony II Cosmogony, Dark energy, Redshift, Big Bang nucleosynthesis, oscillating universe theory, recessional velocity 1 / 10 What is the focus of cosmogony in scientific study? Origin of the universe Motion of planets Formation of stars Study of galaxies 2 / 10 What is the primary component of the universe’s mass-energy composition? Stars Dark matter Dark energy Ordinary matter 3 / 10 What is the significance of redshift in cosmology? Indicates a star’s composition Shows the universe’s contraction Measures a galaxy’s distance and motion Relates to planetary formation 4 / 10 Which element was primarily formed during Big Bang nucleosynthesis? Oxygen Helium Carbon Iron 5 / 10 Which theory suggests that the universe could undergo a “Big Crunch”? Steady-state theory Multiverse theory Oscillating universe theory String theory 6 / 10 The redshift of a galaxy is z=0.5. If the speed of light is c=3×10^8 m/s, what is the galaxy’s approximate recessional velocity? 1.0×10^8m/s 1.5×10^8m/s 2.0×10^8m/s 2.5×10^8m/s 7 / 10 If the age of the universe is approximately 13.8 billion years, what is the approximate Hubble constant H0H_0H0 in km/s/Mpctext{km/s/Mpc}km/s/Mpc? (Assume 1 Mpc≈3.26 million light-years1 , text{Mpc} approx 3.26 , text{million light-years}1Mpc≈3.26million light-years) 50 67 100 73 8 / 10 A star’s light is shifted toward red by a wavelength of 10 nm. If the original wavelength was 500 nm, what is the redshift z 0.01 0.04 0.03 0.02 9 / 10 Using H0=70 km/s, estimate the distance of a galaxy receding at 2100 km/s 50 Mpc 30 Mpc 70 Mpc 100 Mpc 10 / 10 The density of the universe is ρ=9.2×10^−27 kg/m3. If the critical density is ρc=10^−26 kg/m^3, what is the universe’s density parameter Ω? 0.5 0.7 0.9 1.1 Your score is By WordPress Quiz plugin
