Question

Infrared thermometer works on the principle of which of the following Radiation Laws?

• A. Beer's Law
• B. Stefan Boltzmann's Law
• C. Wien's Law
• D. Kirchoff's Law

Hint:

Infrared thermometers:
- Measure emitted IR radiation.
- Based on Stefan Boltzmann's Law (\(E = \sigma T^4\)).
- Used for non-contact temperature measurement.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question tests knowledge of the principle behind infrared thermometers.

Step 2: Detailed Explanation:
Infrared thermometers measure temperature by detecting infrared radiation emitted by an object.
They work on the principle of Stefan Boltzmann's Law (B).
Stefan Boltzmann's Law states:
\[ E = \sigma T^4 \] where E is the total energy emitted per unit area, \(\sigma\) is the Stefan Boltzmann constant, and T is the absolute temperature.
Other laws:
- Beer's Law (A): Relates to absorption of light.
- Wien's Law (C): Relates to the wavelength of maximum emission.
- Kirchoff's Law (D): Relates to emissivity and absorptivity.
Thus, infrared thermometers use Stefan Boltzmann's Law.

Step 3: Final Answer:
Thus, infrared thermometers work on Stefan Boltzmann's Law, which corresponds to option (B).
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