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Should Wizard Hit Mommy? Summary Class 12th English || Theme || Characters || Gist of the story Vistas class 12 English

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Should Wizard Hit Mommy? Summary   John Hoyer Updike (March 18, 1932 – January 27, 2009) was an American novelist, poet, short-story writer, art critic, and literary critic. One of only three writers to win the Pulitzer Prize for Fiction more than once. Updike published more than twenty novels, more than a dozen short-story collections, as well as poetry, art and literary criticism and children’s books during his career. Introduction Little children love to hear stories from their parents at bedtime. Such stories are mostly fables and have no logic behind them. Many a time, parents make up stories out of their own head. Little children take them as literally true. But as the child grows up, he becomes inquisitive. He begins to ask many questions. He wants to know why and how certain things happen. He wants to know the reason behind things. Sometimes parents take this questioning of the child as an affront. They try to discourage it. They want the child to accept as true whatever is...
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A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

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Question : A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.) Answer :  Actual depth of the bulb in water,  d1 = 80 cm = 0.8 m Refractive index of water, μ =1.33 The given situation is shown in the following figure: Where, i = Angle of incidence  r = Angle of refraction = 90° Since the bulb is a point source, the emergent light can be considered as a circle of  radius, R= AC/2 = AO =OB Using Snell’ law, we can write the relation for the refractive index of water as: Using the given figure, we have the relation: tan i = OC / OB =R/d1 ∴R = tan 48.75° × 0.8 = 0.91 m ∴Area of the surface of water = Ï€R² = Ï€ (0.91)² = 2.61 m² Hence, the area of the surface of water through which the light from the bulb can  emerge is approximately 2.61 m².
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QUANTUM NUMBERS (Principal, Azimuthal, Magnetic and Spin)

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                  QUANTUM NUMBERS  Orbitals represent regions in the space around the nucleus where the probability of finding the electron is maximum. A large number of electron orbitals are possible in atom. These can be distinguished by their size, shape and orientation of the orbitals. To describe each electron in an atom in different orbitals, we need a set of three numbers known as quantum numbers. These are designated as n, l and m. In addition to these three numbers another quantum number is also needed which specifies the spin of the electron. These four numbers are called quantum numbers. These are discussed below: 1. Principal quantum number (n) :  This quantum number determines the main energy shell or level in which the electron is present. It is denoted by n. It can have whole number values starting from 1 such as n = 1, 2, 3, 4 ... This quantum number also identifies as shell. The shell with n 1 is called the first sh...
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Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

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  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
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Math question

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A tower, x metre, has a flagstaff at its top. The tower and flagstaff subtends equal angles at a point distant y metre from the foot of the tower. Then find the length of the flagstaff ( in metre). 
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Solar System, Planets, Moons, Asteroid Belt,Kuiper Belt and Oort Cloud, Comets and Meteoroids

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 The solar system consists of the Sun, which is a star at its center, and all the celestial bodies bound by its gravitational pull. These bodies include planets, moons, asteroids, comets, and other objects. Key Components of the Solar System: The Sun : The Sun is the center of the solar system and contains about 99.86% of its mass. It is a star primarily composed of hydrogen and helium, providing the heat and light that sustains life on Earth. Planets : There are eight recognized planets in the solar system: Mercury : The closest planet to the Sun, known for extreme temperature variations and no atmosphere. Venus : Similar in size to Earth but with a thick, toxic atmosphere and surface temperatures hot enough to melt lead. Earth : The third planet from the Sun, the only known planet to support life, with water and a breathable atmosphere. Mars : Known as the Red Planet, it has a cold, dry surface and signs of past water. Jupiter : The largest planet, a gas giant, w...
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