Sound: An elephant can hear sound with a frequency of 15 Hz. What is the wavelength of this wave if the speed of sound in air is 343 m/s?
Fill in the blank(s) with the appropriate word(s).
23 m
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Consider the circuit below. Switch S is closed at t = 0
What is the voltage across the capacitor C just after the switch is closed?
What is the formula mass of a molecule of C6H12O6?
A) 180 amu B) 24 amu C) 29 amu D) 168 amu E) none of the above
You want to determine whether a mystery object is a neutron star or a white dwarf. Which of the following properties would demonstrate that it is definitely a neutron star?
A) It emits most strongly in visible and ultraviolet light. B) It is surrounded by a planetary nebula. C) Every decade or so, it erupts in a nova explosion. D) It dims and brightens more than twice per second.
A normal heat engine is used to drive an electric generator. Part of the power from this generator runs a refrigerator that absorbs the waste heat from the engine and pumps it back into the hot reservoir.
A. first kind B. second kind