Solar Radiation, Heat Balance and Temperature
Manipur Board · Class 11 · Geography
Flashcards for Solar Radiation, Heat Balance and Temperature — Manipur Board Class 11 Geography. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is insolation? Define and explain its importance.
Answer
Insolation is incoming solar radiation - the energy received by Earth from the Sun in short wavelengths. It is the primary source of energy for Earth's atmospheric and surface processes. On average, E…
What are aphelion and perihelion? When do they occur?
Answer
Aphelion: Earth's farthest position from the Sun (152 million km) on 4th July. Perihelion: Earth's nearest position to the Sun (147 million km) on 3rd January. During perihelion, Earth receives slight…
List the five main factors that cause variations in insolation.
Answer
1. Rotation of Earth on its axis 2. Angle of inclination of sun's rays 3. Length of the day 4. Transparency of the atmosphere 5. Configuration of land (aspect) The first three factors have major infl…
Why do higher latitudes receive less insolation than lower latitudes?
Answer
Higher latitudes receive less insolation because: 1. Sun's rays strike at a slant angle, spreading energy over a larger area 2. Slant rays travel through greater atmospheric depth, causing more absorp…
What causes the red color of sunrise/sunset and blue color of the sky?
Answer
Both are caused by scattering of light in the atmosphere. Small suspended particles in the troposphere scatter visible light. Blue light (shorter wavelength) scatters more, making the sky appear blue.
Compare insolation distribution: Where is maximum and minimum received?
Answer
Maximum insolation: Subtropical deserts (about 320 Watt/m²) due to least cloudiness Minimum insolation: Polar regions (about 70 Watt/m²) Note: The Equator receives less insolation than tropics due to …
Define conduction and explain its role in atmospheric heating.
Answer
Conduction is the transfer of heat between two bodies of unequal temperature in direct contact, with energy flowing from warmer to cooler body until both reach same temperature. In atmosphere, land he…
What is convection? How does it heat the atmosphere?
Answer
Convection is the vertical heating of atmosphere through rising air currents. When air in contact with heated Earth surface becomes warm, it rises vertically as currents, transmitting heat to higher a…
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