Question

Vidicon works on the principle of:

• A. Electrical conductivity
• B. Photoconductivity
• C. Thermal conductivity
• D. SONAR

Hint:

Vidicon cameras use photoconductivity to convert light into an electrical signal for video recording.

Answer 1

The Correct Option is B

The question asks about the principle on which a Vidicon operates. Let's explore the options to determine the correct answer and clearly explain the concept involved.

Vidicon Working Principle: A Vidicon is a type of camera tube used in video cameras, popular in the mid to late 20th century. It functions based on the principle of photoconductivity.

1. Photoconductivity: When light (photons) strikes certain semiconductor materials, their electrical conductivity increases. This phenomenon is known as photoconductivity. Vidicons utilize photoconductive surfaces to convert the light images into electrical signals.
2. Electrical Conductivity: This refers to a material's ability to conduct electric current. While relevant to many electrical devices, it does not specifically describe how a Vidicon tube functions.
3. Thermal Conductivity: This is the property of a material to conduct heat. It is not directly related to the functioning of Vidicon tubes.
4. SONAR: SONAR (Sound Navigation and Ranging) is a technique based on sound wave reflection and is not related to visual image sensing or Vidicon operation.

Conclusion: With the above explanations, it's clear that Vidicons work on the principle of Photoconductivity. Therefore, the correct answer is: Photoconductivity.