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--- howto:hambasics:temp [2019/11/25 17:53] – ve7hzf
+++ howto:hambasics:temp [2019/11/25 18:24] – ve7hzf
@@ Line 36: / Line 36: @@
 Now, here's a related question: how long does it take for each wave to complete one cycle?
-  * For the blue wave, we know that it oscillates 150,000,000 times / second, so only one of those time would be 150,000,000<sup>th</sup> of a second.  That is: $\frac{1}{150,000,000}\text{s} = 6.67 \times 10^-9 \text{s} = 6.67 \text{ns}
+  * For the blue wave, we know that it oscillates 150,000,000 times / second, so only one of those time would take 150,000,000<sup>**th**</sup> of a second, or $\frac{1}{150,000,000}$ s or 6.67 x 10<sup>-9</sup> s or 6.67 ns.(("ns" means nanosecond. "Nano" means a billionth of ___))
-  *
+  * Similarly, the green wave oscillates at 50,000,000 cycles per second, so only one of those cycle would take $\frac{1}{50,000,000}$ s or 2 x 10<sup>-8</sup> s or 20 ns.
+The time to complete one full cycle is called the //period (T)// and is the reciprocal of the frequency:
+<latex> \qquad  $$f = \frac{1}{T}  \qquad  \text{or}   \qquad T = \frac{1}{f}$$</latex>
+===== Old =====
 Look at the following two waves.  How are they different?