Question

The waves having maximum wavelength among the following electromagnetic waves is

• A. X-rays
• B. Radio waves
• C. UV waves
• D. Visible rays

Hint:

To remember the order of the electromagnetic spectrum by wavelength (longest to shortest) or frequency (lowest to highest), you can use mnemonics. For wavelength (longest to shortest): Radiant Men In Violets Usually X-ray Girls Radio Microwave Infrared Visible Ultraviolet X-ray Gamma ray Understanding this order is fundamental for comparing properties of different EM waves.

Answer 1

The Correct Option is B

Step 1: Recall the electromagnetic spectrum.
The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The only difference among them is their wavelength and frequency (and thus energy).
The EM spectrum, ordered by decreasing wavelength (and increasing frequency/energy), is as follows:
1. Radio waves
2. Microwaves
3. Infrared (IR)
4. Visible light
5. Ultraviolet (UV)
6. X-rays
7. Gamma rays
Step 2: Compare the wavelengths of the given options.
Let's look at the position of each given option in the spectrum:
X-rays: Located at the shorter wavelength end of the spectrum, with very high energy.
Radio waves: Located at the longest wavelength end of the spectrum, with very low energy.
UV waves (Ultraviolet): Located just beyond the violet end of the visible spectrum, having shorter wavelengths than visible light.
Visible rays (Visible light): Occupies a small portion in the middle of the spectrum, between infrared and ultraviolet.
Step 3: Identify the wave with the maximum wavelength.
Based on the order of the electromagnetic spectrum, Radio waves have the longest wavelength among all types of electromagnetic radiation. Therefore, among the given options (X-rays, Radio waves, UV waves, Visible rays), radio waves have the maximum wavelength. The final answer is \( \boxed{\text{Radio waves}} \).