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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 19.1 | Thermal Radiation. Photon as the Quantum of Light |
1. Calculate the energy radiated in a minute by the window of a melting furnace having a 80 cm2 area when the furnace is at 11230 C. Take the Stefan-Boltzmann as σ = 5.67 × 10-8 J/(K4m2s). Round the answer to the nearest thousand.
Correct Answer: B
2. Calculate the characteristic wavelength emitted by a melting iron piece if its surface temperature is 16000 C.
Correct Answer: A
3. Assuming that the energy delivered by the filament of a 40W bulb is entirely converted into thermal energy of radiation, calculate the filament's temperature if its surface area is 0.4 cm2. Take the Stefan-Boltzmann as σ = 5.67 × 10-8 J/(K4m2s).
Correct Answer: D
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