How far away is most distant galaxy seen in the Hubble Deep Field?
A: About twelve billion (1.2x1010) light years.
B: About eighteen thousand Hubble Distance Units.
C: About forty megaparsecs.
D: About sixty million (6x107) astronomical units.
E: About two hundred billion (2x1011) light years.
Ans: A: About twelve billion (1.2x1010) light years.
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Thin Films: Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 108 m/s)
A. 3.3 × 1014 Hz B. 5.0 × 1014 Hz C. 3.3 × 105 Hz D. 5.0 × 105 Hz
The intensity of a 50-dB whistle is doubled. What is the new decibel level?
a. 50 dB b. 47 dB c. 53 dB d. 100 dB
John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing
up. James says it is just the reverse. Which one, if either, is correct? a. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. b. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. c. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. d. James, because both (b) and (c) above are correct. e. Neither, because the hands exert forces of equal magnitudes.
Why is Galileo Regio, the large circular feature on Ganymede, so dark?
A) It is composed of dense basaltic mantle rock that once flowed like lunar mare. B) It is the result of micrometeorite dust settling onto it over several billion years. C) It has an asphalt-like material that is like the dark side of Iapetus of Saturn. D) It is the result of ultraviolet light from the Sun interacting with the ice and creating a substance that is quite dark. E) It is the site of a recent meteorite impact that scattered a lot of dark, rocky material.