The correct sequence of shortest to longest wavelength is :

Question

Accepted Answer

The question asks for the correct sequence of electromagnetic waves from shortest to longest wavelength. The correct answer is Option 2: Ultraviolet, Visible, Infrared. Let's explain why this is the correct sequence and why the other options are incorrect.

1. **Explanation for Option 2 (Correct Answer):**
   - **Ultraviolet (UV) Light:** Ultraviolet light has the shortest wavelength among the three options. It falls in the range of approximately 10 nm to 400 nm. Because of its short wavelength, UV light has higher energy compared to visible and infrared light.
   - **Visible Light:** Visible light has a longer wavelength than ultraviolet light, ranging from about 400 nm to 700 nm. This is the range of light that is visible to the human eye, encompassing all the colors from violet to red.
   - **Infrared (IR) Light:** Infrared light has the longest wavelength among the three, typically ranging from 700 nm to 1 mm. Infrared light is not visible to the human eye and is often associated with heat.

Therefore, the sequence from shortest to longest wavelength is Ultraviolet, Visible, Infrared, which is why Option 2 is correct.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (Visible, Infrared, Ultraviolet):** This sequence incorrectly places visible light before infrared light, which is correct, but then incorrectly places ultraviolet light as having the longest wavelength, which is not true. Ultraviolet light has the shortest wavelength, not the longest.
   - **Option 3 (Infrared, Visible, Ultraviolet):** This sequence incorrectly starts with infrared light as having the shortest wavelength, which is incorrect. Infrared light actually has the longest wavelength among the three.
   - **Option 4 (Ultraviolet, Infrared, Visible):** This sequence correctly starts with ultraviolet light as having the shortest wavelength, but incorrectly places infrared light before visible light. Visible light has a shorter wavelength than infrared light.

In conclusion, Option 2 is the only sequence that correctly orders the wavelengths from shortest to longest: Ultraviolet, Visible, Infrared.