Vernier Callipers | Least Count

Vernier calliper is a precision instrument used to measure internal and external distances accurately upto (1/10)th of a millimetre. The vernier calliper is as shown in the figure 1. Vernier Constant (VC): It is the difference between values of one main scale division and one vernier scale division of vernier callipers. Let n vernier scale … Read moreVernier Callipers | Least Count

Significant Figures Rules

The number of digits in the measured value which include certain digits plus one uncertain (doubtful) digit are known as significant figures. In this article we will learn Significant Figures Rules and their examples. Rules for Counting the Significant Figures Rule 1: All non-zero digits are significant. Rule 2: All zeros occurring between the non-zero digits … Read moreSignificant Figures Rules

Bohr Atomic Model | Postulates

Neil Bohr, a danish physicist, proposed the Bohr atomic model in 1913. Bohr modified the problems and limitations associated with Rutherford’s model of an atom. Neil Bohr made postulates using Planck’s quantum theory. Postulates of the Bohr Atomic Model 1. The atom has a massively positively charged nucleus. 2. Electrons revolve around the nucleus in a fixed circular path called … Read moreBohr Atomic Model | Postulates

Radioactivity | Definition, Types & Uses

Radioactivity Definition The phenomenon of spontaneous emission of radiations by heavy elements is called radioactivity. The elements which show this phenomenon is called radioactive elements. Radioactivity was discovered accidentally by Antoine Henri Becquerel in 1896. α-particle: It is called as alpha particle. It is a helium nucleus having two protons and two neutrons ( ). β-particle: It … Read moreRadioactivity | Definition, Types & Uses

Atomic Structure | Constituents of an Atom

Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers. Atom The smallest particle of an element is called an atom. An atom can take part in chemical combination and does not occur free in nature. The atom of the hydrogen is … Read moreAtomic Structure | Constituents of an Atom

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