Category: Physics

Which country has the worst air quality? India What disease can air pollution cause? Air pollution can affect lung development and is implicated in the development of emphysema, asthma, and other respiratory diseases, such as chronic obstructive pulmonary disease (COPD). What are the long term effects of air pollution? Long-term health effects from air pollution […]

What is the main theory of evolution? In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time. What are the two ways to […]

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 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? […]