What is the energy of a photon of light of wavelength 4.80 × 10^–7 Hz? h = 6.63 × 10^–34 J?s and 1 eV = 1.6 × 10^–19 J
a. 144 eV
b. 1.38 eV
c. 2.59 eV
d. 2.21 eV
c
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The Milky Way and other spiral galaxies ____
a. must have formed recently, because they contain young stars b. formed spiral arms as the result of major collisions with other galaxies c. created their disks through the process of galactic cannibalism d. must be very old because they contain so much gas and dust e. cannot maintain their disk structure if they suffer a major collision
Which of the following hypothetical observations, if true, would disprove a prediction of the Big Bang theory?
A) the discovery that the temperature of the universe is only 2.73 K B) the discovery of a galaxy moving toward us C) the discovery of two galaxies at the same distance, moving away with slightly different speeds D) the discovery of a galaxy with 30% helium abundance E) the discovery of a galaxy with 10% helium abundance
Two devices that make use of a bimetallic strip are a __________ and a __________
Fill in the blank(s) with correct word
A particle is acted upon by only two forces, one conservative and one nonconservative and neither being a force of friction, as it moves from point A to point B. The kinetic energies of the particle at points A and B are equal if
a. the sum of the works of the two forces is zero. b. the work of the conservative force is equal to the work of the nonconservative force. c. the work of the conservative force is zero. d. the work of the nonconservative force is zero. e. None of the above.