Explanation

• Stars produce energy mainly through nuclear fusion in their cores.
• Hydrogen nuclei combine to form helium and release energy.
• The Sun also generates its energy through nuclear fusion.

Last verified on 11-11-2026

Explanation

• Dispersion is the optical phenomenon where white light is split into its constituent colors, also known as a spectrum.
• This occurs when light passes through a medium with a refractive index that varies with wavelength, such as a prism.

The process of dispersion involves two stages:

1. Refraction (bending of light)
2. Separation of colors (splitting into distinct colors)

The seven distinct colors that make up the visible spectrum, in order, are:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

Last verified on 11-11-2026

Explanation

• A magnetic compass is a device that responds to the presence of a magnetic field by aligning its needle with the direction of the field.
• It is a common tool used to detect and measure magnetic fields.

Last verified on 11-11-2026

Explanation

An atom consists of three subatomic particles:

1. Protons (positively charged)
2. Neutrons (neutral)
3. Electrons (negatively charged)

Additional Information:

• A neutral atom has equal protons and electrons; imbalance creates ions.
• Discovered by John Dalton in 1808 (Atomic Theory).
• Cation = positive ion.
  Anion = negative ion.
• Isotopes = same element with different neutrons.

Last verified on 09-11-2026

Explanation

• - Definition: Splitting of a heavy nucleus into smaller nuclei.
• - Trigger: Often absorbs a neutron.
• - Examples: Uranium-235 and Plutonium-239.
• - Energy: Releases a large amount of energy.
• - Neutrons: Can produce a chain reaction.
• - Uses: Nuclear power generation and nuclear weapons.

Last updated 08 Nov 2026 by NA