The pitch of a sound us most closely related to the

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

What is the speed of an object at a given moment?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.