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Physics Notes Class 11th 12th
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Group 13 Elements (Boron Group):
Includes boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
Boron is a metalloid with unique properties and forms covalent compounds.
Aluminum is widely used in industries due to its lightweight and corrosion-resistant nature.
Gallium is a metal with a low melting point, used in semiconductors and LED technology.
Group 14 Elements (Carbon Group):
Includes carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb).
Carbon is the basis of organic chemistry and has diverse allotropes, including diamond and graphite.
Silicon is a significant component of semiconductors and plays a vital role in modern electronics.
Group 15 Elements (Nitrogen Group):
Includes nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).
Nitrogen is essential for life and exists as diatomic molecules in the atmosphere.
Phosphorus is crucial for biological processes and is used in fertilizers and detergents.
Group 16 Elements (Oxygen Group/Chalcogens):
Includes oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po).
Oxygen is vital for respiration and combustion processes.
Sulfur is widely used in the chemical industry and exists as elemental sulfur and various sulfide compounds.
Group 17 Elements (Halogens):
Includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Halogens are highly reactive nonmetals and exist as diatomic molecules in their elemental form.
Chlorine is widely used as a disinfectant, and iodine is used in antiseptics.
Group 18 Elements (Noble Gases):
Includes helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Noble gases have full valence electron shells, making them stable and unreactive.
Helium is used in balloons and as a coolant in various applications.
Group 16, 17, and 18 Compounds:
Students should know the preparation, properties, and uses of common compounds like sulfuric acid, hydrochloric acid, ozone, hydrogen peroxide, and ammonia.
General Trends in p-Block Elements:
Understanding periodic trends like atomic size, ionization energy, electronegativity, and electron affinity within the p-block elements.
Important Compounds:
Learn about important compounds like borax, boron trifluoride, silicones, phosphine, hydrogen halides, carbon dioxide, sulfur dioxide, etc.
Allotropes and Applications:
Understanding the various allotropes of carbon (diamond, graphite, fullerene) and their applications in technology.
•☑️ Very Important formula
1. (α+в)²= α²+2αв+в²
2. (α+в)²= (α-в)²+4αв
3. (α-в)²= α²-2αв+в²
4. (α-в)²= (α+в)²-4αв
5. α² + в²= (α+в)² - 2αв.
6. α² + в²= (α-в)² + 2αв.
7. α²-в² =(α + в)(α - в)
8. 2(α² + в²) = (α+ в)² + (α - в)²
9. 4αв = (α + в)² -(α-в)²
10. αв ={(α+в)/2}²-{(α-в)/2}²
11. (α + в + ¢)² = α² + в² + ¢² + 2(αв + в¢ + ¢α)
12. (α + в)³ = α³ + 3α²в + 3αв² + в³
13. (α + в)³ = α³ + в³ + 3αв(α + в)
14. (α-в)³=α³-3α²в+3αв²-в³
15. α³ + в³ = (α + в) (α² -αв + в²)
16. α³ + в³ = (α+ в)³ -3αв(α+ в)
17. α³ -в³ = (α -в) (α² + αв + в²)
18. α³ -в³ = (α-в)³ + 3αв(α-в)
ѕιη0° =0
ѕιη30° = 1/2
ѕιη45° = 1/√2
ѕιη60° = √3/2
ѕιη90° = 1
➡️ ¢σѕ ιѕ σρρσѕιтє σƒ ѕιη
тαη0° = 0
тαη30° = 1/√3
тαη45° = 1
тαη60° = √3
тαη90° = ∞
➡️ ¢σт ιѕ σρρσѕιтє σƒ тαη
ѕє¢0° = 1
ѕє¢30° = 2/√3
ѕє¢45° = √2
ѕє¢60° = 2
ѕє¢90° = ∞
➡️ ¢σѕє¢ ιѕ σρρσѕιтє σƒ ѕє¢
1. ѕιη2α = 2ѕιηα¢σѕα
2. ¢σѕ2α = ¢σѕ²α − ѕιη²α
3. ¢σѕ2α = 2¢σѕ²α − 1
4. ¢σѕ2α = 1 − ѕιη²α
5. 2ѕιη²α = 1 − ¢σѕ2α
6. 1 + ѕιη2α = (ѕιηα + ¢σѕα)²
7. 1 − ѕιη2α = (ѕιηα − ¢σѕα)²
8. тαη2α = 2тαηα / (1 − тαη²α)
9. ѕιη2α = 2тαηα / (1 + тαη²α)
10. ¢σѕ2α = (1 − тαη²α) / (1 + тαη²α)
11. 4ѕιη³α = 3ѕιηα − ѕιη3α
12. 4¢σѕ³α = 3¢σѕα + ¢σѕ3α
» ѕιη²Θ+¢σѕ²Θ=1
» ѕє¢²Θ-тαη²Θ=1
» ¢σѕє¢²Θ-¢σт²Θ=1
» ѕιηΘ=1/¢σѕє¢Θ
» ¢σѕє¢Θ=1/ѕιηΘ
» ¢σѕΘ=1/ѕє¢Θ
» ѕє¢Θ=1/¢σѕΘ
» тαηΘ=1/¢σтΘ
» ¢σтΘ=1/тαηΘ
» тαηΘ=ѕιηΘ/¢σѕΘ
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+2
GEOMETRICAL OPTICS
➡️Laws of reflection
➡️ Reflection from plane mirrors
➡️ MIRROR FORMULA
➡️LONGITUDINAL MAGNIFICATION
➡️ SIMPLE MICROSCOPE
➡️ COMPOUND MICROSCOPE
➡️ TELESCOPE
➡️ DEFECTS OF EYES AND CURE
➡️ LENS FORMULA
➡️ SILVERING OF LENS
➡️ PRISM
➡️ DISPERSION
➡️ LAWS OF REFRACTION
➡️REFRACTIVE INDEX
https://t.me/Physics_Notes_Class_11th_12th
Repost from Class 11 12 Science Notes
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ℙ𝕝𝕒𝕟𝕔𝕜'𝕤 ℚ𝕦𝕒𝕟𝕥𝕦𝕞 𝕋𝕙𝕖𝕠𝕣𝕪
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❖ Substances that absorb or emit light discontinuously in the form of small packets or bundles.
❖ The smallest packet of energy is called quantum (plural quanta).
❖ The radiation is propagated in the form of waves.
❖ The energy of a quantum is directly proportional to the frequency of the radiation
E ∝ v
E = hv
E = (hc)/ λ =hc v
Where E = Energy of radiation
h = Planck's constant
= 6.626 * 10^-27 * erg .sec
= 6.626 * 10^-34 Joule.sec
❖ A body that can absorb or emit energy in whole number multiple of quantum.
E = nhv
Where n = 1, 2, 3, 4
❖ The frequency of emitted radiation goes from lower to higher as the temperature increases.
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