An electromagnetic wave propagates along the +y direction as shown in the figure. If the electric field at the origin is along the +z direction, what is the direction of the magnetic field?
A) +z
B) -z
C) +y
D) +x
E) -x
Answer: D
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A cyclotron is designed to accelerate protons to a maximum kinetic energy K. Assuming one then tried to accelerate alpha particles (about four times the mass and twice the charge), what kinetic energy can be achieved?
A. K B. 2K C. 1/2K D. 1/4K E. 4K F. 8K
The _______________ states that an observer cannot distinguish locally the difference between inertial forces due to acceleration and uniform gravitational forces due to the presence of a massive object
Fill in the blank(s) with correct word
Consider the following statement: "Rocky asteroids are found primarily in the asteroid belt and Kuiper belt, while icy comets are found primarily in the Oort cloud." What's wrong with this statement?
A) The Kuiper belt contains icy comets, not rocky asteroids. B) Asteroids are not really made of rock. C) Comets are not really icy. D) The Oort cloud has nothing to do with comets. E) The statement is accurate as written.
The Wilkinson Mapping Project gave:
A) ?o = 1, but matter (dark and visible) is only 27% of this, the rest is dark energy. B) a closed universe, where dark matter triumphs over dark energy. C) an exact picture of the nature of dark energy. D) us proof that 90% of matter is dark, only 10% normal. E) the background cosmic temperature is 4.36 K.