Question

When a lamp is turned on, only about 10% of the energy is transformed into light. What happens to the rest of the energy?

Answer 1

The rest of the energy that is not transformed into light becomes thermal energy

Answer 2

It should be b because physical laws of conservation of energy and matter dictate that the energy is still emitted in some form, so a and d are incorrect. Energy does not convert into matter when it comes light bulbs, therefore b is also incorrect. That leaves only b which is the correct answer.