Why do alarm clocks have 9-minute snooze instead of 10?
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For modern digital alarm clocks: If they are to 9 minutes, the clock only needs to watch the last digit of the time. So, if you hit snooze at 5:45, the alarm goes off again when the last digit hits 4 – at 5:54. They couldn’t make a snooze period 10 minutes, or the alarm would go off right away – alternatively the clock would take more circuitry.
Although modern alarm clocks can be set to any snooze length time, attempts have been made to change the 9-minute snooze cycle but a 9-minute snooze has become the unofficial standard.
isiria.wordpress.com/.../why-is-the-snooze-function-on-alarm-clocks-always-set-to-nine-minute-intervals/
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Your reference is just another answer site and in this case the answer is clearly wrong on several points. The first snooze alarm was an electric clock and could have been designed with any snooze length, what they chose was a rough method that resulted in a delay of between 9 and 9 1/2 minutes. The second snooze alarm clock gave a choice between 5 and 10 minutes. The remarks on digital clocks make no sense, chips don't work that way.
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M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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www.straightdope.com
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Albanian, thank you for pointing this out. I realized I sited the wrong web site. The website my answer came from is: http://www.switched.com/2007/07/09/why-do-alarms-snooze-for-nine-minutes/
I checked your source, http://www.straightdope.com/columns/read/1361/why-does-the-alarm-clock-snooze-button-give-you-nine-extra-minutes-not-ten
and it gave a completely different answer. Also, it's just another question and answer site not a very good source.
I like this explanation because it is a "pseudo-scientific" explanations - another favorite of mine - 9 minutes was the right amount of sleep not to go back into a "deeper" sleep. Sure.
There are all sorts of things out there that are - like the entire Fahrenheit scale - that are "pseudo-scientific". By that I mean, it's based on science, but pretty arbitrary at the same time. Sure, 0 degrees Fahrenheit is the freezing temperature of brine (salt water), by why pick brine?
Maybe someone else has the perfect answer, but if not, I'll go along with the pseudo-science.
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