How many major types of electromagnetic radiation are commonly recognized in the electromagnetic spectrum?

• A. 7
• B. 3
• C. 9
• D. 5

Answer: (A)

Verified step by step guidance

1. Understand that the electromagnetic spectrum is divided into different regions based on wavelength or frequency, each corresponding to a type of electromagnetic radiation.
2. Recall the commonly recognized major types of electromagnetic radiation, which typically include: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
3. Count these categories to determine the total number of major types recognized in the electromagnetic spectrum.
4. Note that these categories are distinguished by their energy, wavelength, and frequency ranges, which define their unique properties and applications.
5. Conclude that the number of major types commonly recognized is the count of these seven categories.