Falsifying a theory: The steady state universe was an alternate hypothesis to the Big Bang. Summarize this hypothesis, and explain the two observations which disproved it
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In the steady state universe hypothesis, the universe is continually expanding, with new galaxies forming in the empty gaps. However, this hypothesis did not predict the existence of the cosmic microwave background, and would imply that galaxies would look the same at all distances. This did not match observations that the population of galaxies at great distances (and hence lookback times) is different from galaxies in the modern universe.
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The ______________number in the periodic table is equal to an element’s number of valence electrons.
Fill in the blank(s) with the appropriate word(s).
Which statement about the stages of starbirth is FALSE?
A) At stage 1, only the cloud exists. B) By stage 3, the star has formed a photosphere. C) Nuclear reactions begin in the core by stage 4. D) The T-Tauri wind is prevalent in stage 5. E) By stage 7, the star has reached the main sequence.
A proton (mass = 1.67 × 10^-27 kg) has a kinetic energy of 1.00 MeV. If its momentum is measured with an uncertainty of 2.00%, what is the minimum uncertainty in its position? (h = 6.63 × 10^-34 J×s and 1 eV = 1.6 × 10^-19 J)
a. 9.08 × 10^-14 m c. 5.64 × 10^-14 m b. 1.14 × 10^-13 m d. 2.28 × 10^-13 m
Define the term viscosity.
What will be an ideal response?