Which statement about electromagnetic radiation is true?

Which statement about electromagnetic radiation is true?

• A. Electromagnetic radiations differ in velocity; they have the same frequency and wavelength.
• B. Electromagnetic radiations have the same velocity, frequency, and wavelength.
• C. Electromagnetic radiations have the same velocity, they differ in frequency and wavelength.
• D. Electromagnetic radiations differ in velocity, frequency, and wavelength.

Answer: (C)

All electromagnetic radiation travels at the same speed in free space—the speed of light. Frequency and wavelength can vary among different waves, but they are inversely related by the equation c = fλ, so a higher frequency means a shorter wavelength and vice versa. Therefore, the correct statement is that these waves share the same velocity while differing in frequency and wavelength. The speed doesn’t change between different electromagnetic waves, which is why differences show up in frequency and wavelength rather than velocity. For example, red and violet light travel at the same speed, but red has a lower frequency and longer wavelength than violet.

All electromagnetic radiation travels at the same speed in free space—the speed of light. Frequency and wavelength can vary among different waves, but they are inversely related by the equation c = fλ, so a higher frequency means a shorter wavelength and vice versa. Therefore, the correct statement is that these waves share the same velocity while differing in frequency and wavelength. The speed doesn’t change between different electromagnetic waves, which is why differences show up in frequency and wavelength rather than velocity. For example, red and violet light travel at the same speed, but red has a lower frequency and longer wavelength than violet.