Question

Which of the following, the correct arrangement of electromagnetic spectrum in decreasing order of wavelength is ______.
Fill in the blank with the correct answer from the options given below

• A. Radio waves, X-rays, Infrared waves, microwaves, visible waves
• B. Infrared waves, microwaves, Radio waves, X-rays, visible waves
• C. Radio waves, microwaves, Infrared waves, visible waves, X-rays
• D. X-rays, visible waves, Infrared waves, microwaves, Radio waves

Answer 1

The Correct Option is C

The electromagnetic spectrum is a range of all types of electromagnetic radiation, which vary in wavelength and frequency. To arrange different types of waves in decreasing order of wavelength, we follow this sequence: 

• Radio waves: Typically have the longest wavelengths in the electromagnetic spectrum, ranging from about 1 millimeter to 100 kilometers or more.
• Microwaves: Have shorter wavelengths than radio waves, generally from 1 millimeter to 1 meter.
• Infrared waves: These range from about 700 nanometers to 1 millimeter.
• Visible waves: The part of the electromagnetic spectrum that human eyes can see, with wavelengths from approximately 380 nanometers to 750 nanometers.
• X-rays: Have much shorter wavelengths, ranging from 0.01 to 10 nanometers.

Arranging the options in the decreasing order of wavelength, the correct sequence is: Radio waves, microwaves, Infrared waves, visible waves, X-rays

Answer 2

The electromagnetic spectrum, in order of decreasing wavelength (and increasing frequency), is:

Radio waves > Microwaves > Infrared waves > Visible light > Ultraviolet light > X-rays > Gamma rays

Let's analyze the given options:

Option 1: Radio waves, X-rays, Infrared waves, microwaves, visible waves

Incorrect. X-rays have a much shorter wavelength than radio waves.

Option 2: Infrared waves, microwaves, Radio waves, X-rays, visible waves

Incorrect. X-rays have a much shorter wavelength than any of the other waves listed.

Option 3: Radio waves, microwaves, Infrared waves, visible waves, X-rays

Correct. This follows the correct order of decreasing wavelength.

Option 4: X-rays, visible waves, Infrared waves, microwaves, Radio waves

Incorrect. X-rays have the shortest wavelength, and radio waves have the longest.

Therefore, the correct arrangement is:

Option 3: Radio waves, microwaves, Infrared waves, visible waves, X-rays