The number of cycles of a wave passing a point per unit time is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.
b
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________ has a rotation period of 59 days, 2/3 as long as its 88 day year
Fill in the blank(s) with correct word
The Dynamo Theory holds that
A) lightning plays a major role in generating our magnetic fields. B) any other planet of similar density will also have a strong magnetic field. C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet. D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors. E) the Earth's magnetic field must switch polarities every few million years.
Several resistors are connected in series. Which of the following statements is correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
Which two factors determine a star's luminosity?
A) radius and surface temperature B) radius and distance from Earth C) surface temperature and distance from Earth D) mass and radius E) mass and surface temperature