What is the explanation of Earth's magnetism?
A) Subatomic particles known as "magnetic poles" reside in the Earth, with one type of magnetic pole residing at Earth's north pole and the other type of magnetic pole residing at Earth's south pole.
B) It is caused by electrically charged material circulating within Earth's hot liquid core.
C) Earth's magnetism a consequence of the world's physics professors all spinning in the same direction.
D) It is caused by a separation of charge within the Earth, with positive static charge residing at one of Earth's poles and negative static charge residing at the other pole.
E) It is caused by charged, or ionized, particles circulating in the air above the solid Earth.
B
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Compton Scattering: An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°. What is the wavelength of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 19.2 pm B. 20.4 pm C. 21.6 pm D. 22.9 pm E. 24.1 pm
Kepler found the orbits of planets are ellipses, not circles
Indicate whether the statement is true or false
A car is rounding the top, or crest, of a hill while moving at a steady 50 km/hr. What can you say about this car's acceleration, and why?
A) The car is not accelerated, because neither its direction of motion nor its speed are changing. B) The car is accelerated, because its speed is changing. C) The car is not accelerated, because its speed is not changing. D) The car is not accelerated, because its direction of motion is not changing. E) The car is accelerated, because its direction of motion is changing.
The theory of seafloor spreading is supported by
A) geological, biological, and climatological data. B) paleomagnetic analysis of the ocean's floor. C) the change in Earth's polarity. D) none of these