Which of the following discoveries would cause us to re-evaluate the nebular theory for forming planets?
A) A star has 20 planets.
B) A star has zero planets.
C) Of the star's five terrestrial planets, one has a large moon.
D) Two of the star's planets are rotating in directions backwards compared to their orbital direction.
E) A star's 5 terrestrial planets orbit in the opposite direction of its 3 jovian planets.
E
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The Local Group of galaxies is dominated by the presence of spiral galaxies
a. True b. False Indicate whether the statement is true or false
An electron is confined in a harmonic oscillator potential well. What is the longest wavelength of light that the electron can absorb if the net force on the electron behaves as though it has a spring constant of 74 N/m?
(mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 210 nm B) 200 nm C) 220 nm D) 230 nm
The speed of sound through the ground is about 6.0 km/s while the speed of sound in air is 343 m/s. A very powerful explosion occurs some distance away and you feel the ground vibrate 60 seconds before you hear the sound of the explosion
How far away is the explosion? A) 20 km B) 22 km C) 25 km D) 27 km E) 30 km
At decoupling, the electrons and protons were made from neutron decay
Indicate whether the statement is true or false