Which of the following form `SiO_(2)` is used in modern radio and television broadcasting and mobile radio communications?

Options

A. Quartz
B. Silica gel
C. Kieselghur
D. None of these

Explanation

To solve the question regarding which form of SiO₂ (silicon dioxide) is used in modern radio and television broadcasting and mobile radio communications, we can follow these steps:

### Step 1: Understand the Context
The question is asking about a specific form of silicon dioxide that is utilized in broadcasting and mobile communications. Silicon dioxide has several forms, including quartz, glass, and amorphous silica.

**Hint:** Consider the properties of different forms of SiO₂ and their applications in technology.

### Step 2: Identify the Relevant Form of SiO₂
Among the various forms of silicon dioxide, quartz is the most relevant in the context of radio and television broadcasting. Quartz crystals are used in oscillators and frequency control devices due to their piezoelectric properties.

**Hint:** Think about which form of SiO₂ is known for its ability to generate precise frequencies.

### Step 3: Confirm the Application
Quartz crystals are widely used in radio frequency (RF) applications, including in the oscillators that stabilize the frequency in radio transmitters and receivers. This makes quartz an essential component in modern communication devices.

**Hint:** Recall the importance of frequency stability in broadcasting and communication technologies.

### Step 4: Conclusion
The form of SiO₂ that is used in modern radio and television broadcasting and mobile radio communications is **quartz**.

**Final Answer:** Quartz (a form of SiO₂) is used in modern radio and television broadcasting and mobile radio communications.