Question

ordering electromagnetic waves based on wavelength
which order shows decreasing wavelength?
gamma → ultraviolet → infrared → radio
infrared → gamma → radio → ultraviolet
radio → infrared → ultraviolet → gamma
ultraviolet → radio → infrared → gamma

Explanation:

Step1: Analyze the direction of wavelength change

The arrow in the diagram indicates that as we move to the right, the wavelength increases. So, for decreasing wavelength, we should move from right to left.

Step2: Check each option

• Option A: gamma → ultraviolet → infrared → radio. This is increasing wavelength (opposite of what we need).
• Option B: infrared → gamma → radio → ultraviolet. The order is jumbled and incorrect for decreasing wavelength.
• Option C: radio (rightmost, longest wavelength) → infrared → ultraviolet → gamma (leftmost, shortest wavelength). This follows the decreasing - wavelength order (moving from right to left as per the diagram).
• Option D: ultraviolet → radio → infrared → gamma. The order is incorrect as radio has a longer wavelength than ultraviolet.

Answer:

C. radio → infrared → ultraviolet → gamma