Explanation

• An atom is electrically neutral when positive and negative charges are equal.
• Protons carry positive charge, while electrons carry negative charge.
• If both are equal in number, the total charge becomes zero.

Additional information:

• The nucleus contains protons and neutrons.
• Electrons move around the nucleus in energy shells.

Last verified on 13-05-2026

Explanation

• Wind energy is produced by moving air (wind).
• The amount of electricity generated depends on wind speed and air movement.
• It is a renewable and environmentally friendly energy source.

Last verified 13-05-2026

Explanation

• A quantum of energy of light (electromagnetic radiation) is called a photon.

• Photon is the smallest discrete packet (bundle) of energy.

• It carries energy proportional to its frequency (E = hf).

• Photons have no mass and travel at the speed of light.

• Light shows particle nature due to photons.

Last verified on 09-05-2026

Explanation

• Photoelectric emission stops when the frequency of incident light is below the threshold frequency of the metal.

• Below this minimum frequency, electrons cannot gain enough energy to escape the metal surface.

• Each metal has its own threshold frequency.

• This effect supports the quantum theory of light.

Last verified on 09-05-2026

Explanation

• Spring tides occur when the Earth, Moon, and Sun are in a straight line (aligned).

• This happens during New Moon and Full Moon phases.

• The gravitational pull of the Moon and Sun combines, producing very high and very low tides.

• Spring tides are not related to seasons like spring; the name refers to “jumping or rising” tides.

• They occur about twice a month.

Last verified on 09-05-2026

Explanation

• Natural gas is mainly transported through pipelines over long distances.

• Pipelines provide a safe, continuous, and cost-effective method of transport.

• For long overseas transport, natural gas is converted into LNG (Liquefied Natural Gas).

Last verified on 09-05-2026

Explanation

• Biomass energy is produced from organic matter such as plants, animals, and waste materials.

• It includes wood, crop residues, dung, and food waste.

• It is a renewable energy source because it can be replenished naturally.

• It releases energy when burned or converted into biogas or biofuels.

• It helps reduce waste and provides an alternative to fossil fuels.

Last verified on 09-05-2026

Explanation

Main Parts of a Cell:

Last verified on 09-05-2026

Explanation

• Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones.
• Prothrombin is a vitamin K-dependent protein directly involved with blood clotting.

• Vitamin C may protect the body against the effects of pollution.
• It may also prevent blood clots and reduce bruising.

Last verified on 31-03-2026

Explanation

• Laser light is intense because its light waves are coherent, meaning they remain in the same phase and travel together.

• Coherent waves combine their energy, producing a strong and focused beam.

• LASER stands for “Light Amplification by Stimulated Emission of Radiation.”

• Laser light differs from ordinary light because it is highly directional and monochromatic.

• Due to very little spreading, laser beams can travel long distances with high intensity.

Last verified on 09-05-2026