A radio galaxy whose lobes are swept back as if forming a tail. This probably indicates that:

A) this is evidence for intergalactic matter.
B) the galaxy is about to evolve into a spiral.
C) the galaxy is isolated, not part of a cluster.
D) the galaxy is moving towards Earth.
E) there must be another galaxy nearby.


A

Physics & Space Science

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A ____ has a few million light sensitive diodes in an array typically about a half-inch square

a. photometer b. charge-coupled device c. spectrograph d. photographic plate e. grating

Physics & Space Science

A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (index of refraction, n = 1.50), and the experiment is repeated

When the apparatus is in benzene, you observe the interference fringes to be A) more closely spaced as when the apparatus is in air. B) equally spaced as when the apparatus is in air. C) more widely spaced as when the apparatus is in air. D) Impossible to tell without knowing the wavelength of light in use. E) Impossible to tell without knowing the separation between the slits.

Physics & Space Science

If R = 4.0 k?, C = 3.0 mF, ? = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb ? Va?



a.
+3.0 V

b.
?19 V

c.
?3.0 V

d.
+27 V

e.
+21 V

Physics & Space Science

The fourth harmonic of a complex tone has a frequency of 600 Hz. What is the frequency of the tone?

Physics & Space Science