Significant figures (also known as significant digits or sig figs) are a way of expressing the precision of a measurement or a number. They are the meaningful digits in a measured or calculated value and are used to indicate the degree of certainty in the measurement. Significant figures are important in scientific and engineering calculations […]
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QUESTION: The unified atomic mass unit, denoted by u, is defined to be . It can be used as an approximation for the average mass of a nucleon in a nucleus, taking the binding energy into account. Find the energy obtained after converting a nucleus of 14 nucleons completely into free energy. Click Here For
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QUESTION: A free neutron can decay into a proton, an electron, and an anti-neutrino. Assume the anti-neutrino’s rest mass is zero, and the rest masses for proton and electron are and respectively. Determine the total kinetic energy shared among the three particles when a neutron decays at rest. Click Here For The Concept SOLUTION: Given:
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QUESTION: The isotope decays via decay. The measured atomic mass of is , and the atomic mass of the daughter nucleus is . Find the Name of the daughter nucleus. the number of nucleons in the daughter nucleus. the atomic number of the daughter nucleus. the number of neutrons in the daughter nucleus. the kinetic energy of
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QUESTION: What is the energy released in the nuclear fusion reaction ? Click Here For The Concept SOLUTION: Given: A nuclear reaction; To find: The energy released in the given fusion reaction. We know the values: The unified atomic mass, Mass of The mass of The mass defect of the given nuclear reaction is calculated
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Let’s understand it by an example. Suppose you have a little glass ball of weight. Let’s convert this completely into its energy contains. By using the formula , you get almost , the same amount of energy as is released in the explosion of a 125,000-ton hydrogen bomb. But is it possible to release this
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Addition of Vectors (Triangle Rule) | Eduvigyan When two effects act together (like wind + river current), the final motion is not found by simple addition. We use vector addition to find the resultant (final speed and direction). Topic: Vectors • Core idea: Resultant of two vectors at an angle Boat–Wind–Current Story (Motivation) Imagine you
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We live in a three-dimensional world. So when an object moves, its direction can change in three independent ways: along x, along y, and along z. To handle such motion neatly, physics uses unit vectors and the resolution of vectors. Topic: Unit Vectors & Resolution of Vectors (3D) What is a Unit Vector? A unit
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When vectors interact, we learn how they are related in space. Vector multiplication allows us to extract hidden geometric and physical meaning— such as angles, projection, work done, rotation, and area. There are two fundamental ways to multiply vectors: Dot Product (scalar result) and Cross Product (vector result). Dot Product (Scalar Product) The dot product
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Physics describes not only how much something happens, but also where and in which direction it happens. This lesson builds the foundation for motion, force, and the laws of mechanics. Topic: Basic Mechanics • Level: Class 9–12 / First-year Start With a Real-Life Example Imagine you tell a friend: “I walked 5 kilometers today.” That
