1. What is a semiconductor? The materials in which the electrical conductivity lies between conductors and insulators are called semiconductors. They have resistivity value between 10-4 to 0.05 ohm-m. The electrical conductivity...
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1. What is a conducting material? The material possessing higher electrical and thermal conductivities are called conducting materials. The resistance of such materials are very low. The conducting property of a material depends...
1. A paramagnetic material has a magnetic field intensity of 104 Am-1. If the susceptibility of the material at room temperature is 3.7×10-3. Calculate the magnetization and flux density in the material. Given H = 104 A m-1, χ...
1. Calculate the intrinsic carrier concentration in germanium at 300 K. Given that me *=1.09 m0, mh *=0.31 m0 and Eg = 0.68 eV. Given T = 300 K, k=1.38×10-23 Jk-1, h=6.626×10-34 Js, m0 = 9.11×10-31 Kg, Eg = 0.68 eV =...
1. A uniform silver wire has a resistivity of 1.54 × 10-8 Ωm at room temperature, for an electrical field along the wire of 1 V/cm. Compute the drift velocity of electron assuming the there are 5.8 × 1028 Conducting...
1. If an ionic crystal is subjected to an electric field of 1000 V/m and the resulting polarization is 4.3 × 10-8 cm², Calculate the relative permittivity of the crystal. Given E = 1000 V/m, ε0 =8.85×10-12 F/m, P = 4.3 ×...
1. A person pulls a bench from one place to another using _____ on the object. Answer : Force 2. A motor cycle-is fitted with springs and shock absorbers, because Answer : It helps to reduce jerks while moving on uneven roads 3...
There are several physical signs of stress, including: Muscle tension: Muscle tension brought on by stress can result in headaches, back or neck discomfort, and general body pains. Fatigue: Chronic stress can make you physically...
A meteorite is a solid chunk of space junk that crashes to the planet’s surface. It is a natural object that made it through the atmosphere of Earth and down to the earth. Depending on where in the solar system they came...
The size, composition, speed, angle of entry, and location of the asteroid’s impact would all affect how it would affect Earth and how it would affect it. A small asteroid may harm the nearby area like a major explosion if...
