A galvanometer has an internal resistance of 100 ? and deflects full-scale at 2.00 mA. What size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 mA,
and how should this resistor be connected to the galvanometer?
A) 50.0 ? in series with the galvanometer
B) 50.0 ? in parallel with the galvanometer
C) 75.0 ? in parallel with the galvanometer
D) 100 ? in parallel with the galvanometer
E) 100 ? in series with the galvanometer
D
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Photoelectric Effect: The work function of a particular metal is 4.20 × 10-19 J. What is the photoelectric cutoff (threshold) wavelength for this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 473 nm B. 308 nm C. 393 nm D. 554 nm
The greenhouse effect raises Earth's surface temperature by roughly
a. 0 K. b. 0.35 K. c. 3.5 K. d. 35 K. e. 350 K.
If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) be four times as large. B) be two times as large. C) decrease to one-half the original power. D) decrease to one-fourth the original power.
Using the energy-time version of the uncertainty principle, estimate the uncertainty in energy of a state with lifetime 10-9 s.
A. 10-2 eV B. 10-7 eV C. 10-12 eV D. 10-15 eV E. 10-18 eV