What is the position of Fermi level in intrinsic semiconductor? In intrinsic semiconductor, the number of holes in valence band is equal to the number of electrons in the conduction band. Hence, the probability of occupation of energy levels in conduction band and valence band are equal. Therefore, the Fermi level for the intrinsic semiconductor […]
What is coordination number and atomic packing factor?
What did the oil drop experiment determine?
What did the oil drop experiment determine? In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces. Why was the oil drop experiment important? […]
How does an ocean thermal energy conversion OTEC system work?
How does an ocean thermal energy conversion OTEC system work? Ocean Thermal Energy Conversion (OTEC) systems use a temperature difference (of at least 77° Fahrenheit) to power a turbine to produce electricity. The vaporized fluid drives a turbine/generator. The vaporized fluid is turned back to a liquid in a condenser cooled with cold ocean water […]
What is the working principle of microwave oven?
What is the working principle of microwave oven? A microwave oven uses microwaves, which are basically radio waves, to cook food. The commonly used frequency is roughly 2,500 MHz (2.5 GHz). Radio waves in this frequency range are absorbed by water, fats and sugars. When absorbed, they are converted directly into heat. What is the […]
Who uses psychrometric chart?
Who uses psychrometric chart? Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure. They are often used to assess the properties of moist air. What is psychrometric chart in HVAC? Psychrometric chart is one of the chart that is commonly used […]
What is the difference between single ended and differential signaling?
What is the difference between single ended and differential signaling? Single-ended inputs are lower in cost, and provide twice the number of inputs for the same size wiring connector, since they require only one analog HIGH (+) input per channel and one LLGND (-) shared by all inputs. Differential signals require signal HIGH and LOW […]
Why do metals have body-centered face-centered and hexagonal centered structures?
Why do metals have body-centered face-centered and hexagonal centered structures? eight strong bonds to the atoms that it touches and six weaker bonds to the atoms it almost touches. This makes it easier to understand why a metal might prefer the body-centered cubic structure to the hexagonal or cubic closest-packed structure. Is face-centered cubic close […]
What is transaction in database management system?
What is transaction in database management system? A Database Transaction is a logical unit of processing in a DBMS which entails one or more database access operation. All types of database access operation which are held between the beginning and end transaction statements are considered as a single logical transaction in DBMS. What is transaction […]
What are the first three steps in the scientific method?
What are the first three steps in the scientific method? The scientific method Make an observation. Ask a question. Form a hypothesis, or testable explanation. Make a prediction based on the hypothesis. Test the prediction. Iterate: use the results to make new hypotheses or predictions. What are the 3 types of scientific methods? Scientists use […]