Which of the following is equivalent to 500 milliwatts?

To determine the equivalent of 500 milliwatts in watts, it's important to know the relationship between milliwatts and watts. One watt is equal to 1000 milliwatts. Therefore, to convert milliwatts to watts, you divide by 1000.

So, if you take 500 milliwatts and convert it to watts:

500 milliwatts ÷ 1000 = 0.5 watts.

This shows that 500 milliwatts is indeed equivalent to 0.5 watts, which corresponds directly to the correct answer. The conversions and calculations adhere to the standard metric definitions, confirming that the measurement is accurate and provides a clear understanding of power units in the context of ham radio operations and equipment specifications.