What is the force on a proton sitting midway between a pair of parallel conducting plates that sit at potentials of -17 V and 55 V, respectively? Their separation distance is 1.5 cm.
a. 
b. 
c. 
d. 
e. 
c.
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Based on the number of galaxies visible in the Hubble Deep Field (Figure 16.1 in your textbook), the estimated number of galaxies in our observable universe is about ________
A) 50,000 B) 100 million C) 100 billion D) Infinity
In a single-slit diffraction experiment, the width of the central maximum is 6.0 mm. The width of the slit is then doubled as is the distance to the screen. What is the resulting width of the central maximum?
a. 12 mm c. 24 mm b. 6.0 mm d. 3.0 mm
In the straight-ahead direction (? = 0°) in Fraunhofer diffraction, which of the following is observed on the screen?
a. a minimum equal in width to the adjacent minima b. a minimum double in width to the adjacent minima c. a maximum equal in width to the adjacent maxima d. a maximum double in width to the adjacent maxima
For the multiplication of 8.704 m × 3.14 m, the result should be reported with ______________ significant figures
Fill in the blank(s) with correct word