If a wave has a wavelength of 0.1 nanometer, it must be a(n)
gamma ray
microwave
radio wave
x-ray

Option D, x-ray

Explanation:

As visible from the image provided, the wavelength of the given waves are as follows -

gamma ray   - meter

microwave  - meter

radio wave  - meter

x-ray - meter

The wavelength of the wave mentioned in the question is 0.1 nanometer which is equal to

meter

This wavelength range is equal to the wavelength of the X-Ray. Hence, the correct answer is option D

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answer; three;