Carl has a 5-inch refracting telescope, and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?
A. Carl's, because lenses gather more light.
B. Carl's, because the larger the diameter, the more light to be collected.
C. Jim's, because the smaller the diameter, the more light to be collected.
D. Jim's, because mirrors gather more light.
Answer: B
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Conversion of Units: The following conversion equivalents are given: 1.0 kg = 1000 g 1.0 l = 1000 cm3 1.0 l = 0.0353 ft3The density of a certain liquid is 0.83 g/cm3. The density of this liquid, expressed in kg/ft3, is closest to
A. 24 kg/ft3. B. 19 kg/ft3. C. 21 kg/ft3. D. 26 kg/ft3. E. 28 kg/ft3.
Based on the frequency with which we see comets from Earth, astronomers estimate the total number of comets in the solar system to be
A) 100 million. B) 1 billion. C) 10 billion. D) 100 billion. E) 1 trillion.
Waves travel along a 100-m length of string with a mass of 55 g, which is held taut by a tension of 75 N. What is the speed of the waves?
A) 3700 m/s B) 370 m/s C) 37 m/s D) 0.37 m/s E) 3.7 m/s
That light has a dual nature is referring to light:
a. having energy and momentum. c. having high- or low-energy photons. b. acting as waves and particles. d. undergoing pair production.