Explanation

• A geostationary satellite orbits the Earth at a speed that matches the Earth's rotation.
• It staying fixed above the same point on the Earth's surface.
• This allows it to maintain a constant position relative to the Earth.

Last verified on 03-07-2026

Explanation

• Speed: ~300,000 km/s (exactly 299,792 km/s)
• Symbol: c
• Medium: Vacuum (space)
• Type: Electromagnetic waves
• Constant: Universal physical constant

Last verified on 16-05-2026

Explanation

• Electric fire alarms work on the principle of expansion of metals due to heat.
• A fire alarm uses a bimetallic strip that bends when heated because different metals expand at different rates.
• This bending completes an electric circuit and activates the alarm.
• It is an example of the thermal expansion principle.

Last verified on 25-06-2026

Explanation

• The primary colors of white light are Red, Green, and Blue (RGB).
• White light is produced when these three colors of light combine in equal amounts.
• This is called the additive color model.
• RGB is used in screens, televisions, and digital displays.

Additional information:

The primary colors of Pigment is:

• Red
• Yellow
• Blue

Last verified on 25-06-2026

Explanation

• Neil Armstrong was the first human to set foot on the Moon on July 20, 1969, during NASA's Apollo 11 mission.
• His famous words upon landing were, "That's one small step for man, one giant leap for mankind."

Additional information:

• Neil Alden Armstrong was died on August 25, 2012.
• He was born on August 5, 1930.

Last verified on 01-04-2026

Explanation

• Symbol: Hg
• Atomic number: 80
• Melting point: -38.83 °C
• Atomic mass: 200.59 u

Last verified on 13-03-2026

Explanation

• Chile saltpeter is the common name for sodium nitrate (NaNO₃).
• It is found naturally in Chile and Peru.
• It is used in fertilizers and explosives.

Last verified on 18-06-2026

Explanation

• The relationship between voltage, current, and resistance is described by Ohm’s Law.
• It states that current is directly proportional to voltage and inversely proportional to resistance.
• The mathematical form is V = IR.

Last verified on 09-06-2026

Explanation

• The thickness of Earth is about 13,700 kilometers (8,500 miles).
• The mantle, which is the biggest part of Earth by volume.
• It is approximately 2,900 kilometers (1,800 miles) thick. 

Last verified on 09-06-2026

Explanation

• Short-sightedness is called Myopia.
• It is corrected by a concave lens.
• This lens is thin in the center and thick at edges.
• It helps light focus on the retina correctly.
• Without correction, distant objects look blurred.

Additional information:

• Long-sightedness is called Hypermetropia.
• It is corrected by a convex lens.
• This lens is thick in the center and thin at edges.
• It helps light focus on the retina properly.
• Without correction, near objects look blurred.

Last verified on 07-06-2026