The waves used by artificial satellites for communication is

Options

A. microwaves
B. infrared waves
C. radio waves
D. X-rays

Explanation

To solve the question regarding the type of waves used by artificial satellites for communication, we can follow these steps:

### Step 1: Identify the context of the question
The question asks about the specific type of electromagnetic waves utilized by artificial satellites for communication purposes.

**Hint:** Consider the characteristics of different types of electromagnetic waves and their applications.

### Step 2: Recall the types of electromagnetic waves
Electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type has different properties and uses.

**Hint:** Think about which types of electromagnetic waves are commonly used in communication technologies.

### Step 3: Analyze the properties of microwaves
Microwaves are a type of electromagnetic wave with a frequency range typically between 1 GHz to 300 GHz. They have specific properties that make them suitable for communication, such as:

- High frequency, which allows for higher data transmission rates.
- Ability to penetrate the Earth's atmosphere effectively, making them ideal for satellite communication.

**Hint:** Consider why certain frequencies are preferred for long-distance communication, especially in the context of satellites.

### Step 4: Conclude the answer
Based on the analysis, microwaves are the preferred choice for communication with artificial satellites due to their high frequency and ability to penetrate the Earth's atmosphere. Therefore, the correct answer is:

**Microwaves.**

### Final Answer:
The waves used by artificial satellites for communication are microwaves.

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