Explanation

• The Law of Cosines is used to find a side or angle of a non-right triangle.
• It relates three sides and one angle of a triangle.
• a,b,c represent the sides of the triangle.
• C is the angle opposite side c.
• It generalizes the Pythagorean theorem for any triangle.

Last updated 24-07-2026 by NA

Explanation

• Germs are microorganisms that can cause disease.
• When germs enter a wound, they may cause an infection.
• Keeping germs out of wounds helps prevent infection.

Last updated 24-07-2026 by NA

Explanation

• The critical temperature of mercury is approximately 4.2 K.
• Effect: Electrical resistance drops to zero below this point. 
• Celsius: ~-269 °C
• Atomic number (Z): 80
• Group: group 12
• Period: period 6
• Block: d-block
• Electron configuration: [Xe] 4f14 5d10 6s2
• Electrons per shell: 2, 8, 18, 32, 18, 2

Last updated 24-07-2026 by NA

Explanation

• Rutherford’s gold foil experiment (1911) showed that an atom has a small, dense, positively charged center called the nucleus.
• The mass of the atom is concentrated in the nucleus, while most of the atom is empty space.

Additional information:

• Nucleus contains: Protons (+) and neutrons (neutral)
• Electrons move around the nucleus in mostly empty space
• The experiment involved alpha particles being deflected by the nucleus.

Last verified on 10-02-2026

Explanation

Kelvin = °C + 273

27 + 273 = 300 K.

Last verified on 06-07-2026

Explanation

• Electromagnetic induction was discovered by Michael Faraday in 1831.
• It is the production of an electric current by a changing magnetic field.
• This discovery led to the development of electric generators and transformers.

Last verified on 22-07-2026

Explanation

• A Leap Year is an astronomical year with an extra day.

Additional information:

• Leap Year: 366 days (February has 29 days).
• Common Year: 365 days (February has 28 days).
• Solar Year: Approximately 365.2422 days (Earth's revolution around the Sun).
• Lunar Year: About 354 days (12 lunar months).
• Recent Leap Years: 2016, 2020, 2024, 2028, 2032.

Last verified on 21-07-2026

Explanation

• Anthropology is the study of human life, culture, and societies.
• It examines human origins, customs, beliefs, languages, traditions, and cultural development.
• Anthropology helps us understand how humans have evolved and how different cultures function.

Additional information:

• Sociology: Human society and social relationships.
• Psychology: Human mind and behavior.
• Biology: Living organisms and life processes.

Last verified on 21-07-2026

Explanation

• Ocean waves generate Hydrokinetic Energy.
• Hydrokinetic energy is produced from the movement of ocean waves, tides, and flowing water without the need for a dam.
• It is a clean, renewable, and environmentally friendly source of energy.

Last verified on 21-07-2026

Explanation

• Wheat is a good source of Vitamin B Complex.
• The bran and germ contain more vitamins than refined wheat flour.
• Scientific Name: Triticum aestivum
• Family: Poaceae (Grass family)

Last verified on 16-03-2026