Explanation

• Electromagnetic waves can travel through a vacuum.
• Light, radio waves and X-rays are examples.
• Sound waves require a material medium to travel.

Last verified on 09-11-2026

Explanation

• The standard approximate value of Earth's gravitational acceleration is 9.8 m/s².
• It is represented by the symbol (g).
• Its value varies slightly with altitude and location.

Last verified on 09-11-2026

Explanation

• Each inner ear contains three semicircular canals.
• They are arranged approximately at right angles to one another.
• They help maintain balance by detecting rotational movements of the head.

Last verified on 09-11-2026

Explanation

• The law of conservation of momentum states that total momentum remains constant in an isolated system.
• External forces can change the total momentum of a system.
• Newton's laws describe the relationship between forces and motion.

Last verified on 09-11-2026

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