The bending of waves as they pass the
sharp edge of an object is called
a) polarization.
b) dispersion.
c) refraction.
d) diffraction.
•
a
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Where does most of the radio emission in a radio galaxy come from?
A. the spiral arms B. a thin shell surrounding the galaxy C. the center D. outside the galaxy in radio lobes
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
A
b.
B.
c.
C.
d.
D.
e.
E.
The corona of the Sun can be observed
a. during a lunar eclipse. b. with a coronagraph. c. using filtergrams. d. during a lunar eclipse and with a coronagraph. e. none of the others.
What are some new techniques and technologies that enable construction of optical telescopes with very large mirrors?
What will be an ideal response?