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Shane Macguire Grade: upto college level
`        A 100 W bulb has tungsten filament of total length 1.0 m and radius 4× 10-5 m. The emissivity of the filament is 0.8 and σ = 6.0 × 10-8 W/m2-K4. Calculate the temperature of the filament when the bulb is operating at correct wattage.`
3 years ago

## Answers : (1)

Deepak Patra
askIITians Faculty
474 Points
```										Sol. Q/t = Ae σT^4
⇒ T^4 = θ/teAσ ⇒ T^4 = 100/0.8 * 2 *3.14 * 4 *10^-5 * 1 * 6 * 10^-8
⇒ T = 1697.0 = 1700 K

```
3 years ago
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