I think the answer is b.boom
Answer:
The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights. The faster the bicycle moves, the greater the induced voltage - and the brighter the lights.
Answer:
B A new compound is formed
Answer:
there is the increase the temperature of cold body and decrease the temperature of hot body
Active Optics.
Hope that helps, Good luck! (:
