How does atomic wall clock work?
The ads are correct. Each and every one of their wall clocks is made of 100% real atoms. as you guessed there is no atomic timekeeper in these clocks. But they do pick up signals transmitted by WWHL, Fort Collins, Colorado. They send out a very low frequency signal, 60KHz, which is very tightly controlled by some very good atomic clocks. The signal is a steady 60,000 cycles per second, with a little fluctuation every minute to send out the current time in binary. The signal is steady enough to give you the current time to the thousandth of a second. The GPS satellites do even better, they can gi ve you the time down to the billionth of a second.
