Q: You are presented with the quiz "What emits light waves?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aflashlight converts chemical energy into light energy" and "light is electromagnetic energy in the form of waves". So, what's the best answer to the question?

Pick your answer from:
(i) an object
(ii) a radio
(iii) sensory neurons
(iv) solid, liquid, gas
(v) a chair
(vi) a flashlight
(vii) harmful substances
(viii) a rock
The answer is:
(vi)