The distance between one positive peak and the next positive peak of a wave is called _____
A. Frequency
B. wavelength
C. elasticity
D. intensity
Answer: Wavelength
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________
a. has a very large "sunspot" on its surface b. is a member of an eclipsing binary star system c. is a white dwarf d. is a Cepheid variable e. is periodically ejecting gas into space, every 93 hours
Earth's magnetic field is
A) something we've learned to live with. B) useful to pigeons but not to humans. C) protective to life on Earth.
An air bubble underwater has the same pressure as that of the surrounding water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A) increases. B) decreases. C) remains constant. D) increases or decreases, depending on the rate it rises.
Two identical cylinders at the same pressure contain the same kind of gas and the same number of moles of gas (in other words, the same amount of gas). If one has two times the volume of the other, what can you say about the relative temperatures of the gas within each of the cylinders?
1.The temperature must be the same. 2.The cylinder with the larger volume must have a temperature on an absolute scale that is ½ the temperature of the other. 3.The cylinder with the smaller volume must have a temperature on an absolute scale that is ½ the temperature of the other. 4.It is impossible to tell because the temperatures could be anything.