*Question T5B05:
Which is equal to 500 milliwatts?*  

*Correct Answer is  B: 0.5 watts*  

### AI Response: (may contain errors)  

To convert milliwatts to watts, you can use the following relationship:

$$
1 \text{ watt} = 1000 \text{ milliwatts}
$$

To find out how many watts are in 500 milliwatts, you can use the formula:

$$
P (\text{watts}) = \frac{P (\text{milliwatts})}{1000}
$$

Substituting in the value:

$$
P (\text{watts}) = \frac{500 \text{ mW}}{1000} = 0.5 \text{ watts}
$$

### Explanation of the Correct Answer:
- **Correct Answer: 0.5 watts (Choice B)**  
  This is correct because 500 milliwatts divided by 1000 equals 0.5 watts.

### Explanation of Incorrect Choices:
- **Choice A: 0.02 watts**  
  This is incorrect because 0.02 watts is only 20 milliwatts, which is much less than 500 milliwatts.

- **Choice C: 5 watts**  
  This is incorrect because 5 watts is equivalent to 5000 milliwatts, which is significantly more than 500 milliwatts.

- **Choice D: 50 watts**  
  This is incorrect because 50 watts equals 50000 milliwatts, which is also much greater than 500 milliwatts.

### Summary:
- To convert milliwatts to watts, divide by 1000.
- 500 milliwatts equals 0.5 watts, making Choice B the correct answer.