The SI unit of intensity is

Options

A. mole
B. kg
C. candela
D. ampere

Answer

To determine the SI unit of intensity, we can follow these steps:

### Step 1: Understand the Concept of Intensity
Intensity generally refers to the amount of energy or power per unit area. In various contexts, it can refer to different types of intensity, such as luminous intensity, sound intensity, etc.

### Step 2: Identify the Relevant Context
In this question, we are specifically looking for the SI unit of luminous intensity, which is a measure of the power emitted by a light source in a particular direction.

### Step 3: Recall the SI Units
The SI units for various physical quantities include:
- Mole (mol) for amount of substance
- Kilogram (kg) for mass
- Ampere (A) for electric current
- Candela (cd) for luminous intensity

### Step 4: Determine the Correct Unit
Among the options provided:
- Mole is not related to intensity.
- Kilogram is a unit of mass.
- Ampere is a unit of electric current.
- Candela is the unit of luminous intensity.

Thus, the correct answer is **Candela (cd)**.

### Final Answer
The SI unit of intensity is **Candela (cd)**.

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