A microscope that can view the surface of insulators with atomic resolution is
(a) A scanning electron microscope
(b) A scanning tunneling microscope
(c) A light optical microscope
(d) An atomic force microscope
(d) An atomic force microscope
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The proper interpretation of the Hubble law (which relates the redshift of a galaxy to its distance) is that as time goes on, galaxies are____
a. staying relatively still in space while the space between the galaxies contracts b. moving away from a common center in space that is neither expanding nor contracting c. staying relatively still in space while the space between the galaxies expands d. moving away from a common center while the space between the galaxies expands e. moving toward a common center in space that is neither expanding nor contracting
Which of the following are examples of the effects of resonance? (Choose the best answer.)
1.the ringing sound that occurs when someone runs a wet finger around a wine glass 2.the shattering of a wine glass by the sound of a human voice at the proper pitch 3.the repeated pushing of a small child on a swing so as to get them to swing quite high 4.all of these
Like Titan, Triton has a nitrogen atmosphere
Indicate whether the statement is true or false
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 50 V, and R = 10 k?, what is the potential difference across the capacitor when I = 2.0 mA?
a.
20 V
b.
15 V
c.
25 V
d.
30 V
e.
45 V