The energy gap for germanium is 0.670 eV at room temperature. What wavelength must a photon have (in nm) to excite the electron to the conduction band?
a. 640
b. 1 090
c. 1 850
d. 2 200
e. 925
c
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The phase of the Moon that one observes on the overhead meridian at 10 P.M. local time is a ______________ moon
a. waxing crescent b. waning crescent c. waxing gibbous d. waning gibbous
The resistivity of a 1.0 m long wire is 1.72 × 10-8 ?m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV
Venus's extremely high surface temperatures are due to
A. a recent impact that heated the planet. B. the composition of its atmosphere. C. volcanic activity. D. its relatively close proximity to the Sun.
A sealed container holds 0.020 moles of nitrogen (N2) gas at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14 g/mol
The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. The average translational kinetic energy of a nitrogen molecule is closest to A) 4.0 × 10-21 J. B) 6.0 × 10-21 J. C) 8.0 × 10-21 J. D) 10 × 10-21 J. E) 12 × 10-21 J.