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NCERT PDF Book Class 11 physics chapter 14 Waves

NCERT Class 11 physics syllabus Session 2025-26 - Param Himalaya  Unit I: Physical World and Measurements  Chapter–1: Units and Measurements Need for measurement: Units of measurement; systems of units; SI units, fundamental and derived units. significant figures, Determining the uncertainty in result. Dimensions of physical quantities, dimensional analysis and its applications.  Unit II: Kinematics  Chapter–2: Motion in a Straight Line Frame of reference, Motion in a straight line, Elementary concepts of differentiation and integration for describing motion, uniform and non- uniform motion, average speed and average velocity and instantaneous velocity, uniformly accelerated motion, velocity - time and position-time graphs. Relations for uniformly accelerated motion (graphical and calculus treatment). Chapter–3: Motion in a Plane Scalar and vector quantities; position and displacement vectors, general vectors and their notations; equality of vectors, multiplication o...

Ncert Solution Chapter 2 स्थिर वैधुत विभव तथा धारिता Class 12 Physics ELECTROSTATIC POTENTIAL AND CAPACITANCE - Param Himalaya

Ncert Solution एनसीईआरटी समाधान कक्षा 12 भौतिकी अध्याय 1 वैधुत आवेश तथा क्षेत्र Class 12 Physics chapter 1 Electric Charges and Fields In Hindi हिन्दी 

Difference Between N-type Semiconductor and P- type semiconductor n-Type Semiconductors p-Type Semiconductors 1. When pentavalent impurity atoms like As, Sb etc. are added in the intrinsic semiconductor, we get n-type semiconductor. 1. When trivalent impurity atoms like gallium, indium etc. are added in the intrinsic semiconductor, we get p-type semiconductor. 2. The majority carriers in n-type semiconductor are electrons and minority carriers are holes. 2. The majority carriers in p-type semiconductor are holes and minority carriers are electrons. 3. $n_e >> n_h$ 3. $n_h >> n_e$ 4. Donor energy level lies close to conduction band. 4. Acceptor energy level lies close to the valence band. 5. Conductivity of a n-type semiconductor $\sigma_n = eN_D \mu_e$ where $N_D$ is number density of donor atom. 5. Conductivity of p-type semic...

Difference Between Intrinsic semiconductor and extrinsic semiconductor Intrinsic Semiconductors Extrinsic Semiconductors 1. Intrinsic semiconductors are the crystals of pure elements like germanium and silicon. 1. When some impurity is added in the intrinsic semiconductor, we get an extrinsic semiconductor. 2. In intrinsic semiconductor, the number density of electrons is equal to the number density of holes. i.e., $n_e = n_h$. 2. In extrinsic semiconductor, the number density of electrons is not equal to the number density of holes. i.e., $n_e \neq n_h$. 3. The electrical conductivity of intrinsic semiconductors is low. 3. The electrical conductivity of extrinsic semiconductors is high. 4. Resistivity is higher. 4. Resistivity is lower. 5. The electrical conductivity of intrinsic semi-conductors mainly depends on their temperatures. 5. Th...

What is intrinsic semiconductor , Valence Bond Theory and Energy Band Theory - Param Himalaya What is intrinsic semiconductor? Give examples. The semiconductor in which the current carriers (holes and electrons) are created due to thermal excitation only across the forbidden energy gap is called an intrinsic semiconductor  A pure semiconductor is called intrinsic semiconductor. It has thermally generated current carriers. Germanium and silicon are frequently used as intrinsic semiconductors. Explanation of Behaviour of Intrinsic Semiconductors on the Basis of Valence-Bond Theory. Structure of an intrinsic semiconductor. The three dimensional diamond like structure for Germanium or silicon or carbon is shown in figure. The lattice spacing for Germanium crystal is 5.66 A° the lattice spacing for silicon crystal is 5.43 A° and the lattice spacing for carbon crystal is 3.56 A° Each atom of silicon (Si) and germanium (Ge) has four valence electrons (i.e., electrons in its outermost shel...

Classification of Metals, Conductors , Insulator and semiconductors on the basis of their conductivity and Energy Bands :  Classification of Metals, Conductors , Insulator and semiconductors on the basis of their conductivity Different solids are classified into three categories namely metals (or conductors), insulators and semiconductors on the basis of the values of their resistivity or conductivity. (i) Metallic conductor :  The substances having very low value of resistivity or very high value of conductivity are termed as metals. The order of the resistivity of metals is $10^{-2}$ to $10^{-8} \Omega$ m. Since, conductivity ($\sigma$) is inversely proportional to the resistivity ($\rho$), i.e., $\sigma = 1/\rho$, therefore, the order of conductivity of the metals is $10^{2}$ to $10^{8} \text{S m}^{-1}$. For example: silver, copper, aluminium, tungsten, mercury etc. (ii) Insulators  The solids having very high value of resistivity or very low value of conductivity are ...

Notes Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Dual nature of radiation. Photoelectric effect. Hallwachs and Lenard's observations. Einstein's photoelectric equation-particle nature of light.  Experimental study of photoelectric effect. Define photon and it's properties   Matter waves-wave nature of particles. De-Broglie relation .