What evidence has Chandra found to contradict the hypothesis that black holes merge during galaxy collisions?
A) a double black hole in a single galaxy
B) a black hole without a host galaxy
C) a hypermassive black hole
D) a triple black hole system
E) a dwarf galaxy containing a black hole
A
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Two speakers are placed side by side and driven by the same frequency of 0.50 kHz. If the distance from a person to one speaker is 5.0 m and the person detects little or no sound,
which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m
An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
A) towards the north. B) towards the south. C) upward. D) downward. E) towards the west.
Which of the five major divisions of chemistry deals exclusively with carbon compounds?
a. Physical chemistry b. Inorganic chemistry c. Analytical chemistry d. Organic chemistry e. Biochemistry
For experiments involving the setup shown in figure Q4.1a, which of the following possible results (if seen) about the value displayed by the ammeter would probably not be consistent with the wave model of light? 
A. It is zero for some time after light starts shining. B. It increases as the light’s intensity increases. C. It varies as the light’s wavelength changes. D. It is zero if the wavelength is larger