Explanation

• Conductors are materials that allow electricity to flow through them, such as copper, aluminum, and gold.
• They have a high concentration of free electrons, which are able to move freely within the material.

Additional information:

• Materials that do not allow electricity to pass through them are called insulators.

Last verified on 07-03-2026

Explanation

• Red stars (Red Dwarfs) are the coolest stars in the universe.
• Their surface temperature is around 3000°C (5400°F).
• Red dwarfs burn their fuel very slowly, lasting trillions of years.

Last verified on 19-03-2026

Explanation

• Galileo Galilei is credited with creating his own improved version of the telescope in 1609.
• It based on the design of the "Dutch perspective glasses".
• He was the first to observe moons of Jupiter, Saturn’s rings, and lunar craters through a telescope.

Last verified on 19-03-2026

Explanation

• A black hole is a region of space where matter has collapsed in on itself.
• It creating an incredibly dense and gravitational field so strong that not even light can escape.
• Black holes are detected via gravitational effects on nearby stars or X-ray emissions.
• Famous example: Sagittarius A* at the center of the Milky Way.

Last verified on 19-03-2026

Explanation

• Earth is located in the Milky Way Galaxy.
• It a spiral galaxy containing hundreds of billions of stars.
• Our Solar System is one of the many systems within this galaxy.

Last verified on 19-03-2026

Explanation

• Copper is an excellent conductor of heat.
• It having a high thermal conductivity (386 W/mK).
• This means it can efficiently transfer heat energy with minimal resistance.
• Metals (e.g., iron, copper, silver, mercury, aluminum) are good conductors of heat.

Last verified on 19-03-2026

Explanation

• In liquids and gases, heat is mainly transferred by convection.
• Convection involves the movement of particles carrying heat from one place to another.
• Essential for weather patterns, ocean currents, and heating systems.

Last verified on 19-03-2026

Explanation

• The flash of light from lightning is a form of electromagnetic radiation, and as such, it travels at the speed of light.
• It is denoted by the letter c.

It is equal to:

• 3 x 10^8 meters per second (m/s) in scientific notation.
• 300,000 kilometers per second (km/s) in metric units.
• 186,282 miles per second (mi/s) in imperial units

Last verified on 19-03-2026

Explanation

• Sound waves in solvents (like liquids) travel as longitudinal waves, where particles vibrate parallel to the direction of wave propagation.
• These are a type of mechanical wave, requiring a medium to travel.

Last verified on 19-03-2026

Explanation

• Tritium, also known as superheavy hydrogen.
• It has 1 proton and 2 neutrons in its atomic nucleus.

Additional information:

• Protium (¹H) → 1 proton, 0 neutrons
• Deuterium (²H) → 1 proton, 1 neutron

Last verified on 19-03-2026