Explanation

• Albert Einstein explained the Photoelectric Effect in 1905 by proposing that light consists of tiny particles called photons.
• He showed that electrons are emitted from a metal surface when light of sufficient frequency falls on it.
• His explanation supported Quantum Theory.
• Einstein received the Nobel Prize in Physics in 1921 for this discovery.

Last verified on 06-07-2026

Explanation

• Gravitational force is the fundamental force that attracts any two objects with mass toward each other.
• It was explained by Isaac Newton through the Law of Universal Gravitation.
• Gravity keeps planets in orbit around the Sun and causes objects to fall toward the Earth.

Last verified on 06-07-2026

Explanation

• 1 Nanometer (nm) = 10⁻⁹ m

Additional information:

• 1 Kilometer (km) = 10³ m
• 1 Meter (m) = 10⁰ m
• 1 Millimeter (mm) = 10⁻³ m
• 1 Micrometer (µm) = 10⁻⁶ m

Last verified on 06-07-2026

Explanation

• The laws of magnetic induction were given by Michael Faraday.
• Faraday proposed these laws in 1831 after discovering electromagnetic induction.
• The laws explain that a changing magnetic field induces an electromotive force (EMF) in a conductor.
• These laws are the foundation of electric generators and transformers.

Last verified on 06-07-2026

Explanation

Kelvin = °C + 273

27 + 273 = 300 K.

Last verified on 06-07-2026