You see lightning before you hear thunder because a) light waves can travel through a vacuum. reactivate b) sound waves cannot travel through the air. c) light waves travel faster than sound waves. d) sound waves travel faster than light waves.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit