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1. Describe in detail and with the aid of diagrams the Photoelectric Effect experiment. (500 words) 2. Describe the Davisson and Germer Electron Scattering Experiment. (500 words) 3. Describe the excitation of electrons in an intrinsic semiconductor and derive an equation for the conductivity of the material. (500 words) 4. Explain what is meant by the following terms in the context of semiconducting materials: (i) p-type, (ii) n-type, (iii) majority carrier, (iv) minority. (500 words) 5. Explain with the aid of energy band diagrams the flow of current through a p-n junction under (i) zero bias, (ii) reverse bias and (iii) forward bias conditions. (500 words)
A charge of 3 nC is placed at the origin. A second - 20 nC charge is placed on the x-axis 3 m to the right of the origin. What is the potential at a point on the x-axis
A yo-yo is made from two uniform disks, each with mass m and radius R, connected by a light axle of radius b. Find the angular acceleration of the yo-yo
A dragster starts from rest and accelerates down a track. Each tire has a radius of 0.320 m and rolls without slipping. determine the linear speed of the dragster
an object is being dropped from a height h 86 meters above ground. assuming no air friction nor winda. show your
A 287g ball is tied to a string. It is pulled to an angle of 4.0o and released to swing as a pendulum. How long is the string
He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633 nm and a power of 0.500 mW spread over a cylindrical beam 1.30 mm in diameter, What is the maximum value of the electric field
At the surface of the Earth, the Sun delivers an estimated 1.43 kW/m2 of energy. Suppose sunlight hits a 16.3 m by 33.3 m roof at an angle of 90.0°. Estimate the total power incident on the roof
1. A spring 12 cm long is used to support a 1.8 kg mass producing a strain of 0.1. What distance does the spring stretch? What is the spring constant?
A slingshot fires a pebble from the top of a building at a speed of 20.00 m/s. The building is 28-m tall. Ignoring air resistance, find out the speed with which pebble strikes the ground when the pebble is fired (a) horizontally (b) vertically str..
In 0.181s, through a distance of 8.05 m, a test pilot's speed decreases from 88.9m/s to 0m/s. If the pilot's mass is 70 kg, how much work is done against his body.
If the induced voltage is 0.5 V, as B field is decreasing at a rate of 0.5 T/s in a loop. Calculate the area of the loop
A series circuit consists of a 50.0-Hz ac source, a 50.0-ohm resistor, a 0.500-H inductor, and a 60.0-µF capacitor. What is the voltage amplitude of the source
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