A region of ionized gas and dust, with imbedded hot young stars, is a(n)
A) emission nebula.
B) dust cloud.
C) dark nebula.
D) nebular hole.
E) absorption nebula.
A
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A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
Dispersing light that has traveled from a hot wire through a cool gas gives what type of spectrum?
a. Line absorption b. Continuous c. Line emission d. Ultraviolet
An air-filled parallel-plate capacitor is connected to a battery and allowed to charge up. Now a slab of dielectric material is placed between the plates of the capacitor while the capacitor is still connected to the battery
After this is done, we find that A) the energy stored in the capacitor had decreased. B) the voltage across the capacitor had increased. C) the charge on the capacitor had increased. D) the charge on the capacitor had not changed. E) None of these choices is true.
Find the resonant frequency for a series RLC circuit where R = 10 ?, C = 5.00 ?F, and L = 2.00 mH.
A. 998 Hz B. 1.59 kHz C. 2.45 kHz D. 11.3 kHz E. 2.53 kHz