The Balmer series of spectral lines corresponds to transitions ending in a state of quantum number n= ________.
Fill in the blank(s) with the appropriate word(s).
2
two
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An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
a. 0.12 ?s b. 1.2 ms c. 0.18 ?s d. 1.8 ms e. 1.8 ?s
When an object is hanging on the end of a vertical spring, what is the amplitude of the oscillating up-and-down motion?
a. The distance the object travels from its equilibrium point to either its lowest point or highest point. b. The length of time the object takes to travel from one point it can reach back to the same point. c. Its journey from one point it can reach back to the same point. d. The distance the object travels from its highest point to its lowest point. e. The number of cycles the wave undergoes in a unit of time.
The universe was ________ old when electrons and positrons formed
Fill in the blank(s) with correct word
Density is defined as
A) size divided by weight. B) mass times weight. C) weight per square inch. D) weight divided by the planet's radius. E) mass per unit volume.