A cubical gaussian surface is bisected by a large sheet of charge, parallel to its top and bottom faces. No other charges are nearby. Through how many of the cube’s faces is the electric flux zero?
1.0
2.2
3.4
4.6
3
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A 3.10-eV electron is incident on a 0.40-nm barrier that is 5.67 eV high. What is the probability that this electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 1.4 × 10-3 B) 9.0 × 10-4 C) 1.0 × 10-3 D) 1.5 × 10-3 E) 1.2 × 10-3
What is the steady state rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature of the glass is -10.0°C and its inside temperature is 25.0°C?
The thermal conductivity of glass is 0.105 W/(m?K), the specific heat of glass is 0.180 cal/(g?°C), and 1 cal = 4.190 J. A) 3.81 W B) 110 W C) 24.2 W D) 47.3 W E) 18.6 W
A high tide is occurring at Charleston, South Carolina (70°W, 12°N). At approximately what other longitude is a high tide occurring?
a. 110°E b. 70°E c. 20°E d. 20°W e. 110°W
What is meant by neutrino oscillations?
a. oscillating movement of neutrinos b. one neutrino type (e.g., muon neutrinos) changing into another (e.g., tau neutrinos) c. random changes in mass of neutrinos d. none of the above