Most stable types of nuclei have an ______________ number of protons and an ______________ number of neutrons
a. even; odd
b. odd; odd
c. odd; even
d. even; even
d
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Eclipsing binaries are the most useful, giving us sizes as well as masses of the pair
Indicate whether the statement is true or false
Which of the following supports the idea that the Martian crust is not divided into moving plates like those on Earth? I. the size of Olympus Mons II. the lack of folded mountain chains III. the lack of rift valleys outlining entire plates IV. the presence of dry river beds and sea floors
a. I & II b. II & III c. II, III & IV d. I, II, & III e. I, II, III, & IV
Phase Angles: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 800 ?, the inductive reactance is 300 ?, and the resistance is 560 ?. What is the phase angle?
A. -42° B. +42° C. -69° D. +69° E. -21°
In Heisenberg's formula, ?p ?x? h, the h symbolizes
A) Planck's constant. B) an average value of Planck's constant. C) the peak value of Planck's constant. D) Planck's constant divided by 2?. E) none of the above