Two 100 W bulbs differ in that one is designed for the American 120 V rms and the other is designed for the European 220 V rms. Which bulb has the greater resistance, and what is that resistance?
A. American, 288
B. American, 144
C. European, 484
D. European, 242 
E. they are the same, 265 
C. European, 484
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Charge: How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10-19 C)
A. 6.3 × 1018 B. 6.3 × 109 C. 1.6 × 1019 D. 1.6 × 109 E. 6.0 × 1023
"Spikes" seen in images of stars are caused by ________.
A. disruption from nearby light sources B. diffraction from the telescope support structures C. dispersion from the telescope's primary lens D. deflection from the inner surfaces of the telescope
According to the ages of the globular clusters, our Galaxy is about ________ times as old as the solar system
Fill in the blank(s) with correct word
The objective and the eyepiece of a microscope have focal lengths of 4.00 mm and 25.0 mm, respectively. The objective produces a real image 30 times the size of the object
The final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm. What is the distance between the object and the focal point of the objective? A) 0.13 mm B) 0.18 mm C) 0.23 mm D) 0.28 mm E) 0.33 mm