Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

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What does the electromagnetic spectrum encompass?

Only visible light

All types of electromagnetic radiation

The electromagnetic spectrum encompasses all types of electromagnetic radiation, which includes a variety of waves with different wavelengths and frequencies. This spectrum ranges from very short wavelengths, such as gamma rays and X-rays, to much longer wavelengths like infrared rays, microwaves, and radio waves.

The visible light spectrum, which is only a small portion of the entire electromagnetic spectrum, is just one segment that our eyes can perceive. Other forms of electromagnetic radiation, such as ultraviolet light and infrared radiation, have significant applications in science and technology. Sound waves, on the other hand, are mechanical waves and do not fall within the electromagnetic spectrum. Therefore, the full range of the electromagnetic spectrum includes all types of radiation, reaffirming that answer choice B is the most comprehensive and accurate.

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Only sound waves and radio waves

Only X-rays and gamma rays

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