A(n) ________ spectrum has dark lines on a continuous background.
A. continuous
B. emission
C. absorption
D. None of these choices are correct.
Answer: C
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Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A) The image of the object will always be smaller than the object. B) The image of the object will always be inverted. C) No matter where you place the object, a real image of the object will be formed. D) No matter where you place the object, the image of the object will always be virtual and upright. E) If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual.
Fluorescent bulbs have recently become much more efficient due to the introduction of
A) high-emission phosphor coatings on the inside of the bulb. B) new types of gases, that glow brighter, within the tube. C) lower density--i.e., lower pressure--gases within the tube. D) electronically controlled high-frequency ballasts. E) longer bulbs.
Answer the following statement(s) true (T) or false (F)
In the region where their beams overlap, two car headlights will create a clear interference pattern on a distant screen.
Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis
a. 7.9 N/C b. 9.0 N/C c. 5.9 N/C d. 6.8 N/C e. 18 N/C