Question

Question 8 (1 point)
What is the energy transformation that occurs when a smoke alarm goes off?

a
Electrical energy to potential energy.
b
Potential energy to electrical energy.
c
Mechanical (sound) energy to light energy.
d
Electrical energy to mechanical (sound) energy.
Question 9 (1 point)
The total amount of energy in the universe never changes, but the availability of each different type of energy to do work can change tremendously.

What best explains this change in available energy?

a
Energy is regularly changing from one form to another.
b
Energy is always converted with 100% efficiency.
c
Energy can only be created through nuclear reactions.
d
Energy can only be transferred as heat.

Answer 1

Question 8: d — Electrical energy to mechanical (sound) energy.

Question 9: a — Energy is regularly changing from one form to another.