When you plot the position of sun-like stars, you will find that ___
a. almost all sun-like stars are found in spiral arms
b. sun-like stars are found in and out of spiral arms
c. sun-like stars are left behind by the spiral arms that created them
d. sun-like stars are only found in the outer 2/3 of the disk
e. sun-like stars are only found in the inner 2/3 of the disk
b
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A specimen is made of 80 atom % iron and 20 atom % Ni. When sufficient FCC nickel is added to BCC iron, it is possible to produce FCC iron-nickel alloys, which are austenitic. The results of an x-ray diffractometer scan of this specimen with cobalt K? radiation that has a wavelength of 0.1790 nm results in peak intensities at the following angles: 26.1°, 30.56°, 45.99°, 57.49°, and 61.74°.
(a) Is this iron-nickel alloy BCC or FCC? (b) Determine the lattice parameter using the 26.1? peak.
Stars on the main sequence with the greatest mass
a. are spectral type M stars. b. are spectral type O stars. c. are located at the bottom of the main sequence in the HR diagram. d. have masses very similar to the sun. e. both b and c
Flares and prominences are more numerous during ________
Fill in the blank(s) with correct word
The reason the rings of Saturn exist is because:
A) the ring material lies within the Roche limit of Saturn. B) the gravitational influence of Titan confines them to those orbits. C) the eruptions of Mimas' volcanoes are keeping them supplied with ice. D) there has not been sufficient time for the ring particles to form a moon. E) Saturn's rapid rotation is spinning material away from its equator, out into space.