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Radiation
Thermal radiation is thermal-energy transfer by electromagnetic waves.
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Radiation
Recommended for Class 10
Radiation
Thermal Radiation
Thermal radiation is thermal-energy transfer by electromagnetic waves.
Unlike conduction and convection, it does not require a material medium.
Energy from the Sun can therefore cross space and reach Earth.
All objects emit thermal radiation. Hotter objects generally emit it at a greater rate.
Dark, dull surfaces are usually good absorbers and emitters. Shiny surfaces are good reflectors and relatively poor absorbers and emitters.
Quick Comparison
Conduction → matter, no bulk flow
Convection → moving fluid
Radiation → electromagnetic waves
Radiation — Advanced
Common Mistakes
Common Mistakes
- Mistake
Radiation ≠ radioactivity.
- Mistake
Vacuum does not stop radiation.
- Mistake
Black colour in this topic refers to radiative behaviour, not conductivity.
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- Definition
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Practice
PQ
Q1. Define radiation.
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Q2. Why is no medium required?
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Q3. Give the Sun example.
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Q4. Compare dark and shiny surfaces.
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Q5. Distinguish radiation and conduction.
Exam Practice
EQ
Q1. Define radiation.
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Q2. Explain Sun→Earth transfer.
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Q3. Compare dark/dull and shiny surfaces.
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Q4. Contrast the three modes of heat transfer.
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Q5. Correct the statement: vacuum stops all heat.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.