What distinguishes an electromagnet from a permanent magnet? Permanent Magnets and Electromagnets: What are the Differences? A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes […]
Which US city is nicknamed the Mile High City because of its height above sea level?
Which US city is nicknamed the Mile High City because of its height above sea level? Denver Is Denver at a higher altitude? Denver is situated at a high altitude of 5,280 feet (one mile high) above sea level. Visitors from lower elevations often underestimate the effects of altitude on their health and physical abilities. […]
Who was arrested for refusing to give up a seat on the bus and why is this significant?
Who was arrested for refusing to give up a seat on the bus and why is this significant? The boycott took place from December 5, 1955, to December 20, 1956, and is regarded as the first large-scale U.S. demonstration against segregation. Four days before the boycott began, Rosa Parks, an African American woman, was arrested […]
What happens in the circuit when the switch is moved from the off position to the on position?
What happens in the circuit when the switch is moved from the off position to the on position? When a switch is in the ‘on’ position it allows the electricity flow to enter the main electrical circuit and the circuit becomes a closed circuit. On the other hand,when a switch is in the ‘off’ position […]
What is the equivalent of 85 decibels?
What is the equivalent of 85 decibels? Topic Overview Noise Average decibels (dB) Vacuum cleaner, average radio 75 Heavy traffic, window air conditioner, noisy restaurant, power lawn mower 80–89 (sounds above 85 dB are harmful) Subway, shouted conversation 90–95 Boom box, ATV, motorcycle 96–100 What’s the loudest sound on earth? The Krakatoa volcanic eruption: Not […]
How do you calculate flow velocity in a pipe?
What is the function of a shock absorber?
What is the function of a shock absorber? The role of the shock absorber is to keep the car’s tyres in permanent contact with the road, helping to provide optimum grip, when cornering and braking. Shock absorbers are part of the suspension, so if the shocks are worn, the vehicle’s ride and comfort is compromised. […]
What are two important quantum mechanical concepts associated with the Bohr model of the atom?
What are two important quantum mechanical concepts associated with the Bohr model of the atom? 2.4 (a) Two important quantum-mechanical concepts associated with the Bohr model of the atom are that electrons are particles moving in discrete orbitals, and electron energy is quantized into shells. How are the quantum mechanical model and the Bohr model […]
What is the position of Fermi level in intrinsic semiconductor?
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 […]