Answer
The correct answer is:
(d) Microwave
Work Step by Step
The diameter of an apple is a few centimeters. The range of wavelengths of radio waves are too long, but the range of wavelengths of microwaves would include wavelengths of a few centimeters. Therefore, if the wavelength of an electromagnetic wave is about the diameter of an apple, it is microwave radiation.
The correct answer is:
(d) Microwave