if three are N atoms in a source of laser light and each atom is emitting light with intensity l, then the total intensity produced by it is

Options

A. NI
B. `N^2I`
C. `N^3I`
D. `N^4I`

Explanation

To solve the problem of finding the total intensity produced by N atoms in a source of laser light, where each atom emits light with intensity I, we can follow these steps:

### Step 1: Understand the Concept of Intensity
Intensity (I) is defined as the power per unit area carried by a wave. In the context of laser light, each atom emits light with a certain intensity.

**Hint:** Recall that intensity is related to the energy emitted by the source and the area over which it is distributed.

### Step 2: Identify the Number of Atoms
We are given that there are N atoms in the source of laser light. Each of these atoms contributes to the total intensity.

**Hint:** Think about how the contributions from multiple sources combine.

### Step 3: Calculate the Total Intensity
Since each atom emits light with intensity I, the total intensity produced by N atoms can be calculated by multiplying the intensity of one atom by the number of atoms.

\[ \text{Total Intensity} = N \times I \]

**Hint:** Consider how intensities from multiple sources add up in a linear manner.

### Step 4: Consider the Nature of Laser Light
In laser light, the emitted light from each atom is coherent and in phase, which can lead to constructive interference. However, for the purpose of this problem, we are simply summing the contributions from each atom.

**Hint:** Remember that in coherent sources, the intensity can be affected by interference, but here we are focusing on the basic addition of intensities.

### Step 5: Final Expression
Thus, the total intensity produced by N atoms, each emitting light with intensity I, is given by:

\[ \text{Total Intensity} = N \cdot I \]

### Conclusion
The total intensity produced by N atoms in a source of laser light, where each atom emits light with intensity I, is \( N \cdot I \).

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