Category: Physics

How do I find out what my meteorite is worth? Meteorites are quite valuable, worth as much as $1,000 per gram, according to the LiveScience website. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more — meaning 1 pound could be worth $1 million. “Meteorites are rarer than […]

What does it indicate if BOD is high? Higher BOD indicates more oxygen is required, which is less for oxygen-demanding species to feed on, and signifies lower water quality. Inversely, low BOD means less oxygen is being removed from water, so water is generally purer. What is COD and BOD of water? COD or Chemical […]

What happens if you drive over 50 on a spare? You should not drive over 50 mph and no more than 50 miles with a donut-type spare tire. Driving for long distances on a spare tire can potentially cause damage to other car parts, including the transmission. Is a spare tire the same as a […]

When electric field is applied on the ends of a conductor the free electrons start moving in direction? These free electrons inside the conductor move randomly and frequently collide with heavier atoms and change their direction of motion every time. When a steady electric field is applied to the conductor, the electrons start moving towards […]

Is leaning forward while sitting bad for your back? Simply put, leaning forward in an attempt to get closer to the computer screen increases the strain on the back, which may cause wear and tear on the joint surfaces, ligaments, and discs. The back muscles are continuously working to maintain the body in an upright […]

Why does a spoon in a glass of water look bent? A spoon half-immersed in a glass of water appears bent at the surface of the water. We know that this is due to refraction of light, which bends the rays of light at the surface, so that the retinal image of the spoon is […]

What are ionic compounds formed by? Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.) Covalent or molecular compounds form when elements share electrons in a covalent bond […]

How do you calculate energy change? To calculate an energy change for a reaction: add together the bond energies for all the bonds in the reactants – this is the ‘energy in’ add together the bond energies for all the bonds in the products – this is the ‘energy out’ energy change = energy in […]

What is quantum number in chemistry? The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers. There are four quantum numbers, namely, principal, azimuthal, magnetic and spin quantum numbers. The values of the conserved quantities of a quantum system are given by quantum numbers. […]

Why can white light be split into Colours? White light is a mixture of many different colours, each with a different frequency . Light is refracted when it enters the prism, and each colour is refracted by a different amount. This means that the light leaving the prism is spread out into its different colours, […]