A proton (mass = 1.67 × 10^-27 kg, charge = 1.60 × 10^-19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 50 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB - VA
a. +20 V
b. -20 V
c. -27 V
d. +27 V
e. -40 V
B
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An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
For a specific element, photons of how many different energies could be emitted by electrons in the n = 3 level as they return to the n = 1 level?
a. 1 b. 4 c. 2 d. 3
The diameter and luminosity of a galaxy do not determine its type
a. True b. False Indicate whether the statement is true or false
What features are unique to Earth?
A. an atmosphere B. precipitation C. volcanoes D. canyons E. None of these features is unique to Earth.