Describe qualitatively how the formation of deuterium and its current abundance is related to the critical density of the universe
What will be an ideal response?
Since stars tend to destroy deuterium, it is assumed that all existing deuterium is primordial. Also, the higher the density of the universe, the more matter is around for the deuterium to react with, so high density means small quantities of deuterium and vice versa. This allows an independent measure of the density of the universe, and reveals that the hadronic (protons and neutrons) mass of the universe is only about 3% of the critical density.
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Calculate the ground state energy of a harmonic oscillator with a classical frequency of 3.68 × 1015 Hz. (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s)
A) 7.62 eV B) 15.2 eV C) 11.4 eV D) 5.71 eV
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW. How many photons are emitted each second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 5.9E+15 b. 3.7E+34 c. 5.9E+24 d. 5.9E+18 e. 1.2E+17
What is the visible surface of the Sun called?
A. the radiative zone B. the chromosphere C. the photosphere D. the corona
Neptune has a highly tilted rotation axis, much like Uranus, and very unlike Saturn's
Indicate whether the statement is true or false