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1. The electron affinity to an isolated neutral Si atom is 1.39eV while to a neutral Si crystal it is 4.02eV. Why is it larger in Si crystal? Give a simple explanation based on electrostatic or Coulomb force.
2. Draw the electron energy level and transition energy diagrams of a second electron attached to a neutral atom, i.e., a neutral atom can bind two electrons in analogy to Figs (b) and (c). Use dark lines or curves for the potential energy well that binds the second electron in question. This situation actually occurs at some impurity and defect centers in semiconductors.
A sound wave of frequency 1440 Hz. propagating through air at 0 degrees Celsius has a pressure amplitude of 17.0 Pa. What is the maximum particle speed (in meters/second)?
Assume blood flow using poiseuille's law. If cholesterol reduces the diameter of an artery by 20%, by what percentage will the blood flow rate be reduced
A crate of mass 14.0 kg is pulled upa rough incline with an initial speed of 1.50 m/s. How much mechanical energy is lost due to friction
A light spring-gun projectile launcher is mounted on an 0.593 kg air track glider. compute the speed of the air-track glider after the gun is fired
A thin film of gasoline floats on a puddle of water. Sunlight falls perpendicularly on the film and reflects into your eyes. The film has a pink hue because destructive interference eliminates the green color (485 nm) from the reflected light. Th..
Air "breaks down" when the electric field strength reaches 3*10^6 N/C, causing a spark. How many electrons must be transferred from one disk to the other to create a spark between the disks
A long solenoid has 80 turns/cm and carries current i. An electron moves within the solenoid in the circle of radius 3.10 cm perpendicular to the solenoid axis. The speed of an electron is 0.0330c (c = speed of light). Find current i.
The velocity of a diver just before hitting the water is -11.9 m/s, where the minus sign indicates that him motion is directly downward. Find him displacement during the last 1.12 s of the dive
A 0.6410-kg ice cube at -12.40°C is placed inside a chamber of steam at 365.0°C. Later, you notice that the ice cube has completely melted into a puddle of water.
A 6.4kg ball, hanging from the ceiling by a light wire 135cm long, is struck in an elastic collision by a 1.80 ball moving horizontally at 4.20 m/s just before the collision. Find the tension in the wire just after the collision.
a flutist assembles her flute in a room where the speed of sound is 340 ms. when she plays the note a it is in perfect
What is the total translational kinetic energy in a test chamber filled with nitrogen (N2) at 2.22×105 Pa and 20.7°C? The dimensions of the chamber are 1.00 m × 4.30 m × 6.50 m. The ATOMIC weight of nitrogen is 28.0 g/mol, Avogadro's number is 6.022 ..
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