The microstructure of the grains of solid ? and ? phases that form in the lead-tin eutectic reaction is _____________ of the ? and ? phases.
Fill in the blank(s) with the appropriate word(s).
plates or layers
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Exceedingly high temperatures are needed in a fusion reactor because _______
a. electrostatic barriers must be overcome b. the fuel must be ionized c. combustion needs heat to occur d. water must be boiled and pressurized.
When light goes from one medium to another medium with a different index of refraction, which of the following do (does) NOT change?
A. the speed B. the wavelength C. the frequency D. the speed and the wavelength E. the frequency and the wavelength
Mercury has only a trace atmosphere because
A. its slow rotation allows atmospheric gases to escape the planet. B. its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury. C. impacts from planetesimals caused its original atmosphere to evaporate away. D. its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
Of the frequencies listed below, to which one is the human ear most sensitive?
a. 33 Hz b. 330 Hz c. 3 300 Hz d. 33 000 Hz