What is the best option for engineering endeavor related to microwave ovens?

Distinguish between a transverse wave and a longitudinal wave.

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.