Category: Physics

Is the atomic number the number of electrons? The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons. The sum of the atomic number Z and the number of neutrons N gives […]

How does vanadium get into the body? Vanadium can enter the body via the lungs or, more commonly, the stomach. Most of the dietary vanadium is excreted. The amount of vanadium resorbed in the gastrointestinal tract is a function of its oxidation state (V(V) or V(IV)) and the coordination environment. How do we use vanadium […]

What type of energy do we use everyday? The common forms of energy used in our houses are electrical energy, chemical energy available from fuels, food and energy originating from the sun. Electrical energy is transformed into many forms – mechanical/kinetic, sound, heat, light, and other forms of electromagnetic radiation – by everyday appliances. How […]

What causes a light bulb to light in a closed circuit? A complete electrical circuit is required to make a light bulb light! Charges moving in the same general direction within a circuit is a current. This can be made with a copper wire, a battery, and a light bulb connected to form a closed […]

What is full form of SI unit? Système international What is called 1 unit? A unit is any measurement that there is 1 of. So 1 meter is a unit. And 1 second is also a unit. And 1 m/s (one meter per second) is also a unit, because there is one of it. What […]

What is the most calming color to paint a bedroom? For a relaxing atmosphere in your bedroom, look to cooler hues — shades of gray, blue, green and purple — to lend a hand. These colors have been shown to reduce stress and anxiety. They can also make a space seem more expansive, so they’re […]

Why is potential energy negative in an atom? When a stable atom is formed, the electron is attracted to the nucleus, r is less than infinity, and the energy will be negative. A negative value for the energy implies that energy must be supplied to the system if the electron is to overcome the attractive […]

What is the relation between charge and mass? The charge-to-mass ratio (Q/m) of an object is, as its name implies, the charge of an object divided by the mass of the same object. This quantity is generally useful only for objects that may be treated as particles. Why does oxygen need 2 electrons? Oxygen needs […]

Why does my foot hurt when I kick a soccer ball? There are a number of reasons which have been mentioned (e.g. air temperature affecting ball stiffness, kicking technique, possible injury). Another reason may be that your anatomy hasn’t developed to sustain kicking a ball. Think about how kickboxers can block with their shins. How […]

What bring a change in the size and shape of an object? An external force may cause a change in the state of motion, size and shape of an object. The force may cause a change in the internal arrangement of molecules making up the object and depending upon the magnitude of the force, the […]