The average density of the Galilean satellites of Jupiter ________ with increasing distance from the planet.

A. does not change
B. increases
C. decreases


Answer: C

Physics & Space Science

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Why does atmospheric pressure decrease as you go higher in altitude on Earth?

A) Gravity gets much weaker with altitude. B) The weight of the atmosphere above you decreases with altitude. C) Temperature decreases with altitude and lower temperature tends to mean lower pressure. D) There are fewer greenhouse gases at higher altitude.

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Which of the following statements DOES NOT show fundamentally how other realms of physics are interconnected to research in cosmology and astronomy?

a. Particle and nuclear physics explains nucleosynthesis to justify the Big Bang. b .The inflationary theory explains the existence of the cosmic microwave background. c. Quantum mechanics explains the formation of neutron stars. d. General relativity explains gravitational lensing. e. Nuclear physics explains fusion reactions within stars and our Sun.

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A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV

What is maximum kinetic energy of the photoelectrons produced?(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 1.6 × 10-19 J B) 3.8 × 10-19 J C) 4.4 × 10-19 J D) 4.9 × 10-19 J E) 5.4 × 10-19 J

Physics & Space Science

When two arches in a magnetic field encounter each other, ____ can cause powerful eruptions called ____

a. solar winds; convective zones b. prominences; limb darkening c. filaments; coronal holes d. supergranules; Coulumb barriers e. reconnection events; flares

Physics & Space Science