The thermopile is a device for detectingSelect one:a. radioactive radiationsb. radiant energyc. X-raysd. the presence of electrons

Break Down the Problem

1. Identify what a thermopile is and its function.
2. Evaluate each answer option regarding the principle of thermopiles.

Relevant Concepts

A thermopile is a device that converts thermal energy into electrical energy. It consists of multiple thermocouples arranged in series or parallel, which generate a voltage when there is a temperature difference across them. The primary application of thermopiles is in detecting radiant energy, particularly infrared radiation.

Analysis and Detail

1. Option a: Radioactive radiations - Thermopiles are not typically used for detecting radioactive radiation.
2. Option b: Radiant energy - This is the correct function of thermopiles. They can detect infrared radiation, which is a form of radiant energy.
3. Option c: X-rays - Thermopiles are not designed to detect X-rays.
4. Option d: The presence of electrons - Thermopiles do not detect electrons directly; they measure temperature differences.

Verify and Summarize

The concept of thermopiles is primarily associated with the detection of thermal radiation or radiant energy, especially in the infrared spectrum.

Final Answer

b. radiant energy