The option which is NOT a form of ionizing radiation is infrared light. The fourth option is correct.
What is electromagnetic wave?
The electromagnetic wave is the white light or Sunlight coming directly from the Sun. This light ray is the form of wave. This light when falls on any object segregates into the range of all types of EM radiation.
Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.
Ionizing radiation can remove electrons from the atoms, or in other words it can ionize atoms. The infrared radiation is not capable of doing this.
So, the form of ionizing radiation is not an infrared light.
Thus, the fourth option is correct.
Learn more about electromagnetic wave.
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