Food is cooked faster in a pressure cooker due to its
A) greater rate of bubble formation in the water.
B) higher thermal energy.
C) higher temperature.
D) none of the above
Answer: C
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In a hydrogen atom, a given electron has n = 7. How many values can ? have?
A) 6 B) 7 C) 15 D) 33 E) 98
Galileo's observation of sunspots showed that ________.
A. planets moved along elliptical orbits around the Sun B. the Sun was not a flawless sphere C. the stars could change D. Earth revolved around the Sun E. None of these choices is correct.
Inside a freely-falling elevator you would have no
A) gravitational force on you. B) weight. C) both of these D) none of the above
For interference to occur, which of the following must be true?
1.The light sources must be in phase and of different colors. 2.The light sources must be out of phase and have different wavelengths. 3.The light sources must be out of phase and monochromatic. 4.The light sources must be in phase and the same wavelength.