Radio telescopes have poor resolving power because
a. their diameters are so large.
b. the energy they receive is not electromagnetic radiation.
c. radio waves have long wavelengths.
d. a and b
e. none of the above
C
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The high ____________________ of quasars reveals to astronomers that they must be very distant
Fill in the blank(s) with correct word
Dirty bombs may be less of a threat than people fear, because
A. once spread out, the rem level drops below the radiation illness threshold B. dirty bombs require plutonium, and that is hard for terrorists to obtain C. the radioactivity is too small to induce cancer D. the radiation does not actually get out of the bomb case, even when exploded
All three circuits shown below have R = 100 ?, L = 0.1 H and emf ? = (5.0 V) sin (377 t). Which statement regarding the angular resonance frequencies ?A, ?B, and ?C is correct?
?
?
a.
?C > ?A = ?B
b.
?C < ?A = ?B
c.
?A = ?B = ?C
d.
?B < ?A = ?C
e.
?B > ?A = ?C
Order the following in order of increasing efficiency of detecting photons of visible light
A) eye, photographic film, CCD B) photographic film, CCD, eye C) CCD, eye, photographic film D) CCD, photographic film, eye E) eye, CCD, photographic film