Question
On average, a hydrogen atom emits a 21 -cm photon once every 15 million years. How many 21 -cm photons does a $100-M_{\odot}$ gas cloud emit per second?
Step 1
To convert years to seconds, we need to multiply by the number of seconds in a year. There are 365 days in a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. So, the number of seconds in a year is 365 * 24 * 60 * 60 = 31,536,000 seconds. Show more…
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