A lamp contains a metal filament that becomes incandescent when an electric current passes through it. The central part of the filament is at a very high temperature. The two ends of the filament, which are attached to the lamp base, are cooler. Which statement is correct?
- ASome thermal energy is conducted to the base of the lamp.
- BThe filament radiates energy equally at all points along its length.
- CThe lamp transfers all of the electrical energy it receives into light energy.
- DWhen the voltage across the filament is halved, the power output is halved.