How did Ptolemy discover refraction? The Roman astronomer Ptolemy first tried to experimentally derive the law of refraction in the 2nd century CE. Ptolemy measured the angle that a beam of light hits a boundary, the angle of incidence, and the angle at which it leaves, the angle of refraction, through different mediums. What skin […]
How can you prevent the harmful effects of visible light?
How can you prevent the harmful effects of visible light? You can protect your eyes from harmful sunlight and minimize the effects of glare by using a brimmed hat or visor in combination with absorptive lenses. Absorptive lenses are sunglasses that filter out ultraviolet and infrared light, reduce glare, and increase contrast. Will LED light […]
How do you find a leap year or ordinary year in 75 years?
What is the 30 30 rule for lightning?
What are examples of polar covalent bonds?
What are examples of polar covalent bonds? A polar bond is a covalent bond in which there is a separation of charge between one end and the other – in other words in which one end is slightly positive and the other slightly negative. Examples include most covalent bonds. The hydrogen-chlorine bond in HCl or […]
Can asteroid destroy the whole world?
Can asteroid destroy the whole world? The impact of an object much larger than 1 km diameter could well result in worldwide damage up to, and potentially including, extinction of the human species. What is the largest object in the Kuiper Belt? Pluto What is the difference between asteroid belt and Kuiper Belt? Asteroids are […]
What did Aristotle say about motion?
What did Aristotle say about motion? Summary: Basically, Aristotle’s view of motion is “it requires a force to make an object move in an unnatural” manner – or, more simply, “motion requires force” . After all, if you push a book, it moves. Why is God called the Unmoved Mover? Thought according to Aristotle is […]
What are the advantages and disadvantages of moving iron instrument?
What are the advantages and disadvantages of moving iron instrument? Advantages and disadvantages of moving iron instruments Scales not uniform. For low voltage range the power consumption is higher. The errors are caused due to hysteresis in the iron of the operating system and due to stray magnetic field. In case of A.C. measurements, change […]
What is the SI unit of viscosity and surface tension?
What is the SI unit of viscosity and surface tension? kgs−2,kgm−1s−1. What is the dimensional formula for surface tension? Or, T = [M1 L1 T-2] × [L-1] = M1 T-2. Therefore, surface tension is dimensionally represented as M1 T-2. What is the dimensional formula of critical velocity? Critical velocity (VC) = Re η / ρ […]
Where do stars die?
Where do stars die? Answering the question, “How do stars die?” also depends on its mass. The most massive stars quickly exhaust their fuel supply and explode in core-collapse supernovae, some of the most energetic explosions in the universe. A supernova’s radiation can easily (if only briefly) outshine the rest of its host galaxy. What […]