Explanation

• Mars is known as the Red Planet due to its reddish appearance.
• Its surface contains iron oxide (rust) which gives it a red color.
• It is the 4th planet from the Sun in the solar system.
• Mars has two small moons: Phobos and Deimos.
• Mars is often called the “planet of future exploration”.

Last updated by NA on 05-11-2026

Explanation

• Wilhelm Conrad Rontgen discovered X-rays
• He was discovered on 8 November 1895.
• He got the Nobel Prize in Physics in 1901.

Additional questions

• The penetrating power of X-rays depends on their frequency

Last updated by NA on 05-11-2026

Explanation

• The average distance from the Earth to the Sun is approximately 150 million kilometers.
• It is also called 1 astronomical unit (or AU).

Last updated by NA on 04-11-2026

Explanation

Formula of parallel plate capacitor:

C = ε₀ x A / d

Where:

C = capacitance = 1 F

ε₀ = permittivity of free space = 8.85 x 10⁻¹² F/m

A = area of plates = ?

d = distance between plates = 1 mm = 0.001 m = 10⁻³ m

We need A:

A = C x d / ε₀

Put values:

A = 1 x 10⁻³ / 8.85 x 10⁻¹²

A = 10⁻³ / 8.85 x 10⁻¹²

A = (1 / 8.85) x 10⁹

A = 0.1129 x 10⁹

A = 1.129 x 10⁸

A ≈ 1.13 x 10⁸ m²

Last verified on 03-11-2026

Explanation

Kinetic Energy = 1/2 x m x v^2

m of electron = 9.1 x 10^-31 kg

v = 10^6 m/s

KE = 0.5 x 9.1 x 10^-31 x (10^6)^2

KE = 0.5 x 9.1 x 10^-31 x 10^12

KE = 4.55 x 10^-19 J

Convert J to eV:

1 eV = 1.6 x 10^-19 J

Energy in eV = 4.55 x 10^-19 / 1.6 x 10^-19

Energy = 2.84 eV

Last verified on 03-11-2026