The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

Options

A. microwave, infrared, ultraviolet, gamma rays
B. infrared, microwave, ultraviolet, gamma rays
C. gamma rays, ultraviolet, infrared, microwaves
D. microwaves, gamma rays, infrarred, ultraviolet

Answer

To determine the decreasing order of wavelength for infrared, microwave, ultraviolet, and gamma rays, we can follow these steps:

### Step 1: Understand the Electromagnetic Spectrum
The electromagnetic spectrum is a range of all types of electromagnetic radiation, which are categorized by their wavelengths. The order from longest wavelength to shortest wavelength is as follows:
- Radio Waves
- Microwaves
- Infrared (IR)
- Visible Light
- Ultraviolet (UV)
- X-rays
- Gamma Rays

### Step 2: Identify the Wavelength Ranges
Next, we need to know the specific wavelength ranges for each type of radiation:
- **Microwaves**: Wavelength ranges from about 0.1 meter to 1 millimeter (1 mm = 1 x 10^-3 m).
- **Infrared (IR)**: Wavelength ranges from about 1 millimeter to 700 nanometers (700 nm = 700 x 10^-9 m).
- **Ultraviolet (UV)**: Wavelength ranges from about 400 nanometers to 1 nanometer (1 nm = 1 x 10^-9 m).
- **Gamma Rays**: Wavelengths are less than 0.01 nanometers (10^-3 nm).

### Step 3: Compare the Wavelengths
Now, we can compare the ranges:
- Microwaves have the longest wavelength.
- Infrared has a shorter wavelength than microwaves but longer than ultraviolet.
- Ultraviolet has a shorter wavelength than infrared but longer than gamma rays.
- Gamma rays have the shortest wavelength.

### Step 4: Arrange in Decreasing Order
Based on the above comparisons, we can arrange the types of radiation in decreasing order of wavelength:
1. Microwaves
2. Infrared
3. Ultraviolet
4. Gamma Rays

### Final Answer
The decreasing order of wavelength of infrared, microwave, ultraviolet, and gamma rays is:
**Microwave > Infrared > Ultraviolet > Gamma Rays**