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11th Chemistry NCERT notes

Stoichiometry and Stoichiometry Calculations

The word ‘stoichiometry’ is derived from two Greek words – Stoicheion (meaning element) and metron (meaning measure). The study of chemical reactions and...
11th Chemistry NCERT notes

Mole Concept

Dalton’s Atomic Theory The origin of the idea that matter is composed of small indivisible particles called ‘a-Tomio’ (meaning — indivisible). In 1808, Dalton published...
11th Chemistry NCERT notes

Laws of Chemical Combinations

Laws of Chemical Combinations The combination of elements to form compounds is governed by the following five basic laws. Law of conservative of mass Law...
11th Chemistry NCERT notes

Significant Figures

Significant Figures The reliability of a measurement is indicated by the number of digits used to represent it. To express it more accurately we express...
11th Chemistry NCERT notes

Matter, Measurement, SI Unit

Chemistry is the branch of science that deals with the composition, structure and properties of matter. Chemistry is called the science of atoms and...
Beats & Doppler Effect

Beats & Doppler Effect

Beats The phenomenon of wavering of sound intensity when two waves of nearly same frequencies and amplitudes traveling in the same direction, are superimposed on...
Standing Waves and Normal Modes

Standing Waves and Normal Modes

The interference of two identical waves moving in opposite directions produces standing waves. For a string with fixed ends, the standing wave is given...
Reflection of waves

Reflection of waves

Reflection of waves A part of the wave is reflected and a part is transmitted into the second medium. If a wave is an incident...
The Principle of Superposition of Waves

The Principle of Superposition of Waves

The Principle of Superposition of Waves The net displacement of any element of the string at a given time is the algebraic sum of the...
Speed of a Travelling wave

Speed of a Travelling wave

Speed of a Travelling wave Wave velocity or phase velocity: The distance covered by a wave in the direction of its propagation per unit time...