Today the majority of the mass of the universe is already in the form of black dwarfs, the solution to the "dark matter" problem
Indicate whether the statement is true or false
FALSE
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Transformers: If the primary coil of a transformer contains more loops than the secondary coil then it is a
A. step-up transformer. B. step-down transformer.
Elastic Collisions: In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. Both balls have the same mass. This type of collision is
A. somewhat inelastic. B. elastic. C. completely inelastic.
When it is struck by 240-nm photons, a material having a work function of 2.60 eV emits electrons. What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 2.58 eV B) 5.18 eV C) 2.00 eV D) 4.21 eV
What is meant by "dark energy"?
A) the energy associated with dark matter through E=mc2 B) any unknown force that opposes gravity C) the repulsive agent causing the universal expansion to accelerate D) highly energetic particles that are believed to constitute dark matter E) the total energy in the Universe after the Big Bang but before the first stars