William Herschel thought he had found a comet when he spotted the green disk of:
A) Triton.
B) Uranus.
C) Neptune.
D) Titania.
E) Oberon.
B
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Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies, both active and inactive. b. Radio jets are seen from low-mass black holes plus accretion disks inside our galaxy. c. Jets and accretion disks have been observed in active galaxies. d. Black holes can produce so much energy in such a small place. e. All of the other choices are correct.
Process of Science: How did scientists determine the location of the center of the Milky Way, and why had they been wrong in their previous estimate (where they placed the Sun near the center)?
What will be an ideal response?
In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
a. The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths. b. The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths. c. The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present. d. The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present. e. The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?
A) 15 A B) 1.4 A C) 0.73 A D) 2.0 A