Explanation

• For rectification, we use a diode (or p-n junction diode) as a rectifier.
• Process: Converts AC to DC
• Types: Half-wave, Full-wave, Bridge

Explanation

• Power is the amount of energy transferred or converted per unit time
• Mathematical formula: P = Work ÷ Time.
• Power is a scalar quantity.
• Common symbols: P
• SI unit: watt (W)
• In SI base units: kg⋅m2⋅s−3
• Dimension unit:  M L^2 T^− 3

Last updated 13-March-2026

Explanation

Explanation

• Remote Sensing is the science of collecting information about the Earth’s surface without direct contact.
• It is mainly done using satellites equipped with special sensors and cameras in space.
• These satellites capture images and data used for mapping, weather forecasting, and environmental monitoring.

Last verified on 12-03-2026

Explanation

• Wind energy is a form of kinetic energy produced by the movement of air.
• This moving air rotates the blades of wind turbines or fans to generate electricity.
• Wind power is an important renewable and clean energy source.

Last verified on 12-03-2026

Explanation

• Meteorologists are scientists who study the atmosphere and weather conditions.
• They forecast tornadoes, hurricanes, floods, and other weather events using satellites, radar, and computer models.
• Their work helps in early warning systems and disaster management.

Last verified on 12-03-2026

Explanation

• Wavelength is the distance between two successive crests or two successive troughs in a transverse wave.
• It represents one complete cycle of a wave.

Additional information:

• Symbol used: λ (Lambda)
• SI unit: meter (m)
• Wave formula: v = fλ
• Example wavelength values: 1 m, 0.5 m, 10 cm, 500 nm, 700 nm
• Visible light wavelength range: ~400 nm – 700 nm

Last verified on 12-03-2026

Explanation

• LED (Light Emitting Diode) is a semiconductor device that emits light when electric current passes through it.
• It is widely used in lighting, displays, electronic indicators, and screens.

Additional information:

• Energy efficiency: Up to 90% more efficient than traditional bulbs
  First discovery: H. J. Round – 1907
  Early research: Oleg Losev – 1927
  Practical LED development: James R. Biard – 1961
  First commercial production: October 1962 (Nick Holonyak)

Last verified on 12-03-2026

Explanation

• Venera-9 was the first spacecraft to land on the surface of Venus.
• Launched by the Soviet Union in 1975.
• It was designed to study the Venusian atmosphere and surface.
• It successfully transmitted data from the planet's surface for 53 minutes before its batteries failed.

Last verified on 12-03-2026

Explanation

• An optical instrument used to measure the properties of visible light is called a Spectroscope.
• It analyzes the composition and properties of materials based on the light they emit or absorb.
• It helping us understand the physical and chemical properties of objects in the universe.

Last verified on 12-03-2026