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A Si sample is doped with arsenic impurities at a concentration of 10^17 cm^-3. Calculate the intrinsic electron concentration and compare it to the extrinsic electron cocncentration, assuming all the arsenic impurities are ionized. Use the effective mass of the electron and hole as 20% of the free mass of the electron.
We were given the answer as 6.3 x 10^8 cm^-3, but I have no idea where to begin on this as we weren't given a temperature so I can't calculate the intrinsic concentration.
a liquid of density 1.31 times 103 kgm3 flows steadily through a pipe of varying diameter and height. at location 1
A mass m1 = 3.8 kg rests on a frictionless table and connected by a massless string over a massless pulley to another mass m2 = 5.5 kg which hangs freely from the string, What is the tension in the string as the block falls
To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. What was the raven's speed right after the collision
a 2.80-m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 0.250
The gravitational acceleration on the Moon is a sixth of that on Earth. The weight of an apple is 1.03 N on Earth. What is the mass of the apple
The potential at the center of a uniformly charged ring is 52 kV, and 15 cm together the ring axis the potential is 41 kV. Find the ring's radius and its total charge.
a current path shaped as shown in the figure produces a magnetic field at p the center of the arc. if the arc subtends
A 3 m long rigid beam with a mass of 115 kg is supported at each end. An 60 kg student stands 2 m from support 1. How much upward force does each support exert on the beam.
Suppose a 65 kg person stands at the edge of a 6.5 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1850 kg m2. Calculate the angular velocity of the turntable
At what depth under water does the pressure increase by 100,000 Pa? The Earth rotates with a period of one day. What is its rotational speed in revolutions per minute? The Earth rotates with a period of one day. What is its rotational speed in revolu..
A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handl..
A cannon is fired from the ground. The cannonball initially travels with a speed of 300 m/s at an angel of 25 degrees with respect to the ground, What is the cannonballs maximum height
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