Question

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

Answer 1

If you are going to invent a new device that people can use instead of a microwave oven to warm up leftovers, the type of electromagnetic wave that would be most useful to investigate would probably be infrared waves, because these kinds of waves are associated with heat. 

Answer 2

Answer:

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.