Which of the following statements is true?
A. Even though X-rays have higher energy, they move with the same speed as that of visible light.
B. X-rays have higher energy, but still they move slower than visible light.
C. X-rays have higher energy, hence they move faster than visible light.
D. None of these choices are correct.
Answer: A
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Answer the following statement(s) true (T) or false (F)
The point toward which compasses on the earth’s surface point is a magnetic south pole.
A hollow cylindrical (inner radius = 1.0 mm, outer radius = 3.0 mm) conductor carries a current of 80 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 2.0 mm from the axis of the conductor
a. 8.0 mT b. 3.0 mT c. 5.3 mT d. 16 mT e. 1.2 mT
If a net external force acts on a system, what will change?
a. The sum of the momenta of all objects in the system. b. The momentum of no more than one object in the system. c. The sum of the magnitudes of each momentum. d. The momentum of exactly one object in the system. e. The momenta of all but one of the objects in the system.
Where does most rainfall on Earth finally end up before becoming rain again?
A) underground B) in lakes C) in the oceans D) on the ground surface