Three wires of the same diameter and length are made from three different metals: copper (? = 1.7 × 10^–8 ?·m), aluminum (? = 2.7 × 10^–8 ?·m), and silver (? = 1.6 × 10^–8 ?·m). Which wire has the least resistance?
a. the aluminum wire
b. the silver wire
c. the copper wire
d. Since insufficient information is given to find the resistance of each wire, one cannot find the answer.
b
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Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?
A) A refracting telescope uses a transparent glass lens to focus light, whereas a reflecting telescope uses a mirror to focus light. B) A refracting telescope produces refracted images, whereas a reflecting telescope produces reflected images. C) Reflecting telescopes make much clearer images than refracting telescopes of the same size. D) It is much easier to make a large refracting telescope than a large reflecting telescope.
Asteroid impacts large enough to cause mass extinction on Earth occur roughly once every 100 million years. Use that fact to estimate the probability that such an event will occur in your lifetime, which you can take to be approximately 100 years. What's your estimate of that probability?
A) 1 in 100,000,000 B) 1 in 10,000 C) 1 in 1,000,000 D) 1 in 100,000,000,000
Calculate the radius in nanometers of the Bohr orbit of a hydrogen atom's electron with n = 6
What happens to the rotation of a molecular cloud as it collapses to form a star?
A) The rotation rate remains the same and results in stellar rotation. B) The rotation dissipates and any residual is left in small overall rotation of the star. C) The rotation rate increases and results in fast rotation of the star. D) The rotation rate increases and results in a flattened disk of material around a protostar. E) The rotation increases the speed of collapse and produces more massive stars.