Which is the correct evolutionary order?
a. protostar, ZAMS, YSO b. protostar, YSO, ZAMS
c. ZAMS, protostar, YSO d. ZAMS, YSO, protostar
b
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Which stellar population has highly elliptical orbits?
a. Pop I extreme b. Pop I intermediate c. Pop II intermediate d. Pop II extreme
In nuclear fusion, energy is produced because:
a) Hydrogen is not stable. b) the mass of the reacting chemicals is larger than that of the products. c) of the energetic impact of collisions. d) gravity leads to collapse. e) positrons are produced.
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.
What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 0.20 m?