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Solar Radiation, Heat Balance and Temperature

Himachal Pradesh Board · Class 11 · Geography

Quick revision notes for Solar Radiation, Heat Balance and Temperature — Himachal Pradesh Board Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.

60 questions22 flashcards5 concepts

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Key Topics to Revise

1

Solar Radiation and Insolation

  • Insolation is incoming solar radiation - the energy Earth receives from the Sun
  • Earth receives 1.94 calories per sq. cm per minute at the top of atmosphere
  • Earth's position affects solar energy: Perihelion (3rd January - 147 million km from Sun) receives more energy than Aphelion (4th July - 152 million km from Sun)
2

Passage of Solar Radiation through Atmosphere

  • Atmosphere is largely transparent to short-wave solar radiation
  • Water vapour, ozone, and gases absorb near-infrared radiation in troposphere
  • Small particles scatter visible light, adding color to sky
3

Heating and Cooling of Atmosphere

  • Four methods of heat transfer: Conduction, Convection, Advection, Terrestrial Radiation
  • Conduction: Direct heat transfer between bodies in contact - heats lower atmosphere
  • Convection: Vertical movement of heated air currents - confined to troposphere
4

Heat Budget of Earth

  • Earth maintains constant temperature through heat balance
  • 100 units of insolation at top of atmosphere
  • 35 units reflected back (27 from clouds, 2 from ice/snow, 6 from atmosphere)

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Full Notes

Key Concepts

Incoming solar radiation received by EarthKey factors includeEarth maintains constant temperature by balancingFour main processesTemperature distribution is controlled by

Frequently Asked Questions

What are the important topics in Solar Radiation, Heat Balance and Temperature for Himachal Pradesh Board Class 11 Geography?
Solar Radiation, Heat Balance and Temperature covers several key topics that are frequently asked in Himachal Pradesh Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Solar Radiation, Heat Balance and Temperature — Himachal Pradesh Board Class 11 Geography?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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