The energy from an AGN is produced by
a. the collision of two spiral galaxies.
b. the collision of two elliptical galaxies.
c. the collision of two radio jets.
d. matter flowing into a supermassive black hole.
e. supernovae.
d
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If a sample is bombarded with high-energy electrons, there are two forms of x-rays emitted: continuous-wavelength x-rays and _________x-rays.
Fill in the blank(s) with the appropriate word(s).
Graphical Analysis: An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is
A. a horizontal straight line. B. a vertical straight line. C. a straight line making an angle with the time axis. D. a parabolic curve.
A concave mirror with a radius of curvature of 1.0 m is illuminated by a candle located on the symmetry axis 3.0 m from the mirror. Where is the image of the candle?
Spherical Mirrors: An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm. How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?
A. 18 cm B. 24 cm C. 30 cm D. 36 cm E. 42 cm