You are going to invent a new device that people can use instead of a microwave oven to warm up leftovers. which type of electromagnetic wave would be most useful to investigate?
gamma rays
x–ray
radio waves
infrared waves

Infrared Waves

Explanation:

Since electromagnetic waves are of different energy range is used for different works

Higher energy range electromagnetic waves are not good to expose for human so we can not use them for warming purpose as they are dangerous.

So X rays and Gamma rays can not be used

Also radio waves are of least energy so they can not be used for the purpose of warming.

So correct answer for the replacement of microwaves is infrared waves because they have sufficient energy that can be used to warm up.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force