Category: Physics

What are 3 devices that use electromagnets? Electromagnets are very widely used in electric and electromechanical devices, including: Motors and generators. Transformers. Relays. Electric bells and buzzers. Loudspeakers and headphones. Actuators such as valves. Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks. MRI machines. Can magnets make something spin forever? It is […]

What generates the final carrier frequency? Explanation: An oscillator, in most applications a crystal oscillator, generates the final carrier frequency. A modulator simply adds the information signal and an antenna transmits the signal. Why is carrier frequency high? To increase the energy of the signal we need to increase the frequency. this is when the […]

What type of word is interference? noun. an act, fact, or instance of interfering. something that interferes. What is an interference sentence? a disruption between two or more things that most likely causes the action to stop. Examples of Interference in a sentence. 1. I didn’t know if Ms. Smith would believe my excuse, but […]

Why no tracks are left on ice during ice skating? The weight of the body acts on a very small area of skate in comparison to that of ice. Under this high pressure ice melts to form water below 0°C. But as soon as the skater moves further the water does not experience any pressure […]

What is migration of birds for class 3? Bird migration is the natural seasonal movement, often south and north along a flyway, in between the breeding grounds and wintering grounds. Migratory birds fly several kilometers in search of the best environmental specifications and habitats for food, breeding and raising their young ones. What are the […]

What is the formula for amplitude in simple harmonic motion? x(t)=Acos(ωt+φ). x ( t ) = A cos ( ω t + φ ) . This is the generalized equation for SHM where t is the time measured in seconds, ω is the angular frequency with units of inverse seconds, A is the amplitude measured […]

Which has the greater amount of internal energy? Which has the greater amount of internal energy: an iceberg or a cup of hot coffee? Defend your answer. The iceberg has the greater internal energy (“amount of heat”), because it has so very much more mass than the cup of coffee. This is true even though […]

Why are dams thicker at the base compared to the top? You can see from the diagram that the dam is much thicker at the bottom than it is at the top. This is because the pressure of the water is much greater deeper down and the dam needs to be thick at the bottom […]

What is the relationship between intensity of scattered light and its amplitude? The intensity of scattered is found to be inversely proportional to the fourth power of wavelength of light. This relation holds when the size of air molecules is much smaller than the wavelength of the light incident. Is loudness directly proportional to amplitude? […]

Which is the best choice for the handle of a frying pan? Metal What happens if you put metal in boiling water? The rapidly moving molecules in the boiling water bump the molecules in the metal spoon. This bumping transfers kinetic energy to the molecules that make up the spoon, causing them to vibrate faster. […]