Concept:Electrical energy can be converted into light energy in certain devices.
Explanation:A fluorescent tube uses electrical energy to excite mercury vapour inside the tube.
This produces ultraviolet light, which then causes the phosphor coating to emit visible light.
An electric bell mainly converts electrical energy into sound energy.
A radio converts electrical energy into sound energy through its speaker.
A lantern usually uses chemical energy from fuels or batteries, not necessarily electrical energy to light.
Therefore, the device that transforms electrical energy into light energy is the fluorescent tube.
Answer:B. Fluorescent tube