The deepest and most powerful earthquakes occur at ___________.
A) Mid-ocean ridges
B) Continental rifts
C) Subduction zones
D) Transform faults
Ans: C) Subduction zones
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Is it possible for an observer at 28°N to see the full moon on the zenith? Why or why not?
Matter Waves: The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) (a) What is its de Broglie wavelength these electrons?(b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
Fill in the blank(s) with the appropriate word(s).
Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field 
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs t.
Microwaves have ________ wavelengths and ________ energies compared to the visual band
a. shorter, higher b. longer, lower c. shorter, lower d. longer, higher