Explanation

• Sunlight travels at the speed of light (~3 × 10⁸ m/s).
• Takes 8 minutes 20 seconds on average to reach Earth.
• Sunlight takes approximately 499 seconds to travel from the Sun to Earth.
• Distance traveled: 150 million km from Sun to Earth.
• Moonlight takes only 1.3 seconds to reach Earth.

Last verified on 13-03-2026

Explanation

• A rainbow is produced due to the dispersion of sunlight by water droplets in the atmosphere.
• White sunlight splits into seven colours when it passes through raindrops.
• The formation of a rainbow involves refraction, dispersion, and internal reflection.
• Dispersion is the phenomenon responsible for separating white light into its constituent colours.
• Rainbows are usually seen opposite the Sun after rainfall.

Last verified on 26-07-2026

Explanation

• EAX is a 32-bit register, meaning it can hold 4 bytes of data
• Its sub-parts:

• AX — the lower 2 bytes (16-bit)
• AH — the upper 1 byte (high byte of AX)
• AL — the lower 1 byte (low byte of AX)

Last updated 24-07-2026 by NA

Explanation

A commercial Polaroid — referring to the polarizing material/filter used in various commercial applications — can be called by any of these names:

• Polarizer — a general term for anything that polarizes light
• Polaroid filter — specifically referencing the Polaroid brand of polarizing filters
• Polarizing filter — a technical term describing the function (a filter that polarizes light)

Last updated 24-07-2026 by NA

Explanation

• For the point $(6,9)$:
• x2+y2=62+92=36+81=117
• Since $117>100$, the point (6,9) lies outside the circle.

Last updated 24-07-2026 by NA

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

• 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