You are presented with the question "A light bulb emits what when turned on?" and the following answer choices: 
- movement
 - warmth
 - photons
 - sunlight
 - motion
 - sun's heat
 - dangerous
 - Heart rate

Now knowing that alight bulb converts electrical energy into light energy when it is turned on and aphoton is a packet of light energy, choose the best answer.


 

   photons      