Final answer:
The SI unit for measuring time is the second. For a typical TV ad, which is a short duration event, seconds would be the most appropriate unit, making 1) Seconds the correct answer to the student's question.
Step-by-step explanation:
The SI unit for measuring time is the second (s). In the context of the duration of a typical TV ad, the most appropriate unit to use would be seconds, because TV ads usually last from a few seconds to several minutes. Mentioning days, weeks, months, and years would not make sense here since we are dealing with a much smaller timeframe.
When performing conversions between time units, it's important to remember that there are 60 seconds in a minute and 60 minutes in an hour, making one hour equal to 3600 seconds. Since TV advertisements typically last for less than a minute, seconds are the most relevant unit.
Therefore, the correct answer to the question about the SI unit for the duration of a typical TV ad is: 1) Seconds