5
In what form is solar energy radiated from the sun?
EXPLANATION
Biodiesel Properties & Engine Performance
- Nature of Solar Radiation:
- Radiation Mechanism: The Sun acts as a blackbody radiator at an effective surface temperature of approximately $5778\text{ K}$.
- Form of Radiation: Solar energy propagates through the vacuum of space exclusively as electromagnetic waves (transverse oscillating electric and magnetic field photons traveling at the speed of light $c \approx 3 \times 10^8\text{ m/s}$).
- Spectrum: Spans ultraviolet ($\lt 0.4\ \mu\text{m}$, ~7%), visible ($0.4 - 0.7\ \mu\text{m}$, ~47%), and infrared ($\gt 0.7\ \mu\text{m}$, ~46%).
- Conclusion: Electromagnetic waves (Option 2).
Correct option: (2) Electromagnetic waves
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