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The energy gap in silicon is 1.1eV. The average electron effective mass is 0.31m, where m is free electron mass. Calculate the electron concentration in the conduction band of silicon at T=300K
A proton with a speed 1.5 x 10^5 m/s falls through a potential difference of 100 volts, gaining speed. What is the speed reached
An airplane of mass 1.40 x 10^4 kg is in level flight, initially moving at 56.0 m/s. Find the speed of the airplane after it has traveled 4.4 102 m
A lottery machine uses blowing air to keep 2000 Ping-Pong balls bouncing around inside a 1.0m X 1.0m X1.0m box. What is the mean free path between collisions
According to a reliable report, in 1795 a member of the Turkish embassy in England shot an arrowto a distance of 441m. calcualte what must have been the minimum initial speed of the arrow
q1. an audience of 2750 fills a concert hall of volume 35000 m3. if there were no ventilation by how much would
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Calculate the velocity of the target ball after the collision
An electric dipole is formed from ±1.0nCcharges spaced 2.00mm apart, What is the electric field strength at the points (x, y) = (14.0 cm , 0 cm),(x, y) = (0 cm, 14.0 cm)
A wheel has a radius of 0.5 m. If the wheel rotates on its axis through an angel of 46 degrees, what distance does a point on the rim of the wheel move
You have probably never noticed time dilation effects in everyday life. Calculate the speed that a friend would have to move with respect to you so that your measured time intervals are 1.00% larger than hers
While a person is walking, his arms swing through approximately a 45.0^\circ angle in 0.520s. What is the acceleration of a 1.60 gram drop of blood in the fingertips at the bottom of the swing
A ball is thrown upward with an initial velocity of 12.0 m/s at an angle of 50.0 deg above the horizontal. find the ball's greatest height above the ground
A microscope with an 6.5-mm-focal-length objective has a tube length of 14.0cm. how far should the objective lens be from the specimen
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