The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10?10 m. The electric potential created by the electron at the position of the proton is
A. ?13.6 V.
B. +13.6 V.
C. ?27.2 V.
D. +27.2 V.
E. +5.12 × 109 V.
Answer: C
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An ideal transformer has an input voltage of 20,000 V and an output voltage of 260 V. If the input current is 26.0 A, what is the output current?
A. 1.70 A B. 10.0 A C. 100 A D. 200 A E. 2000 A
Ideal Gas Law: A sealed cylinder fitted with a movable piston contains ideal gas at 27°C, pressure 0.500 × 105 Pa, and volume 1.25 m3. What will be the final temperature if the gas is compressed to 0.800 m3 and the pressure rises to 0.820 × 105 Pa?
A. 42°C B. 68°C C. 130°C D. 250°C E. 150°C
The average speed of electrons flowing though the filament of a dc flashlight bulb is
A) about the same speed as sound in metals. B) dependent on how quickly electrons bumps into one another. C) the speed of light. D) 1000 cm/s. E) a snail's pace of less than 1 cm/s.
The unit for current is the
a. ampere. b. ohm. c. coulomb. d. volt.