For a specific element, photons of how many different energies could be emitted by electrons in the n = 3 level as they return to the n = 1 level?
a. 1
b. 4
c. 2
d. 3
d
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If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude. B) your latitude and the direction that is due north for you. C) your longitude and the direction that is due north for you. D) your latitude and the local time. E) your latitude, longitude, and local time.
If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
A. 24.5 N B. 49.0 N C. 69.3 N D. 98.0 N E. 139 N
The largest difference between Mars' northern and southern hemispheres is that
A) the northern is higher overall, despite some high volcanoes in the south. B) the northern has all the outflows and must have been much hotter. C) the southern has a polar cap, but none ever forms in the north. D) the southern is much darker, with large mare-like basaltic lava flows. E) the southern appears older, with more impact craters.
In a series LRC circuit, the frequency at which the circuit is at resonance is f0. If you double the resistance, the inductance, the capacitance, and the voltage amplitude of the ac source, what is the new resonance frequency?
A) f0 B) f0/4 C) 2 f0 D) f0/2 E) 4 f0