What is the velocity of propagation if a wave has a frequency of 12. Hz and a wavelength of 3.0 m?
A) 4.0 m/s
B) 6.0 m/s
C) 0.25 m/s
D) 28 m/s
E) 36 m/s
E
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A magnetic field is generated by a current-carrying wire. Which one of the following statements concerning this situation is false?
a) The magnitude of this magnetic field decreases with increasing distance away from the wire. b) A right-hand rule is useful for determining the direction of the magnetic field at a particular location. c) The magnitude of the magnetic field is directly proportional to the magnitude of the current. d) The magnetic field is parallel to the direction of the current in the wire.
No work is done by gravity on a bowling ball that rolls along a bowling alley because
A) no force acts on the ball. B) little distance is covered by the ball. C) the force on the ball is at right angles to the ball's motion. D) the ball's speed remains constant.
A merry-go-round is set into motion with a child on board. The rotational speed of the merry-go-round ________ as the child moves inward along a radius.
Fill in the blank(s) with the appropriate word(s).
Uranium-238 decays to Thorium-234 by emitting which of the following?
a. beta b. alpha c. gamma d. positron