Terms Related to an Ellipse: Fundamental Terms Ellipse (Horizontal ellipse) Conjugate Ellipse(Vertical ellipse) (a) Equation x²/a² + y²/b² = 1 (a > b) x²/a² + y²/b² = -1 (a < b) (b) Graph (c) Centre C (0, 0) C (0, 0) (d) Vertices (±a, 0) (0, ±b) (e) Length of major axis 2a 2b (f) Read more about Ellipse[…]
Rate is defined as the change in the amount of the substance or concentration of the substance with respect to time. . Let us consider a general reaction, Reactants → Products During the progress of a chemical reaction, Concentration of the reactants are decreases with time and concentration of products increases with time. The following Read more about Rate of a Chemical Reaction[…]
Teaser 1: A man was outside taking a walk, when it started to rain. The man didn’t have an umbrella and he wasn’t wearing a hat. His clothes got soaked, yet not a single hair on his head got wet. How could this happen? Teaser 2: A cowboy rides into town on Friday, stays for three Read more about Puzzle 4[…]
It is the emission of electrons from the surface of certain substances, mainly metals, when they are illuminated by electromagnetic radiations like X-rays, ultraviolet and even visible light. The electrons emitted are called photo electrons. Experiment to Demonstrate Photoelectric Effect: In figure (a) A and C are two zinc plates, connected to positive and negative Read more about Photo Electric Effect[…]
Puzzle 1: 14 students in a class failed in both QT and Accounts. 20 failed in QT, but 32 failed in Accounts. How many students were there in total? Answer: 20 + 32 – 14 = 38 students. Puzzle 2: Solve this puzzle: S is as much older than K as he is younger than Read more about Brain Teaser 11 [With Answers][…]
Let S be the focus, ZK the directrix and e the eccentricity of the ellipse whose equation is required. Draw SK perpendicular from S on the directrix. Divide SK internally and externally at A and A’ (on SK produced) respectively in the ratio e : 1. ∴ ⇒ SA = e. AK … (1) And Read more about Standard form of the ellipse[…]
Puzzle 1: 14 students in a class failed in both QT and Accounts. 20 failed in QT, but 32 failed in Accounts. How many students were there in total? Puzzle 2: Solve this puzzle: S is as much older than K as he is younger than P. N is as old as K .Which of Read more about Brain Teaser 11[…]
Crystal field theory differs from valence bond theory in viewing the complex as held together by purely electrostatic attractions. That is, it ignores covalent bonding. The most significant aspects of the theory is its concern with the effect that the ligands have on the energies of the d-orbitals of the metal. The ligands are viewed Read more about Crystal Field Theory (CFT)[…]
Puzzle 1:Answer: 6:06 Explanation: From Left to Right, The time on the watches increases by 2 hours 3 minutes, then decreases by 1 hour 16 minutes, alternately. Puzzle 2:Answer: 3:36 Explanation: On each watch, the time shown contains two digits that are the same. Puzzle 3:Answer: 6:45 Explanation: From left to right, add 1 to Read more about Clock Puzzles 7 [With Answers][…]
General form of Ohm’s law: At a constant temperature potential difference across a conductor is directly proportional to the current passing through it V α I V = RI Ohm’s law is material dependent because it is defining resistance of the material. Those which obeys ohm’s law and are known as ohmic or linear conductor, Read more about Ohm’s law[…]