Spectral Series: What is the shortest wavelength in the Paschen series?
A. 410.2 nm
B. 410.2 ?m
C. 365 nm
D. 820.4 nm
E. 820.4 ?m
Answer: D
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Suppose you are looking at the sky at about midnight on the December solstice. Based on the given right ascensions and declinations, which of the following stars will be nearest to your meridian? Assume you live at a latitude where all the stars on this list rise above your horizon each day. (Hint: Recall that the Sun's celestial coordinates on the December solstice are RA = 18h, dec = -23-1/2°.)
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
The rotational inertia of the dumbbell (see figure) about axis A is twice the rotational inertia about axis B. The unknown mass is:
On the H-R diagram, most bright naked eye stars would lie at the ________
Fill in the blank(s) with correct word
A sonic boom occurs only as an airplane just reaches the speed of sound in air, but not after it increases its speed further
A) True B) False