A microwave oven produces energy waves with wavelengths that are . •shorter than visible light
•longer than visible light
•the same length as visible light
•not part of the electromagnetic spectrum

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.