If two magnets' poles are not labeled, how can you tell which poles are the same and which are different?
Give a brief history of IR and mention the landmark developments in this field.
Justify why these ions do not exist under normal conditions (a)
K2+K^{2+} K2+
(b)
O−O^- O−
For a 5-kHz5\text{-kHz}5-kHz sine wave, how long does it take for a. 14\frac{1}{4}41 cycle? b. 12\frac{1}{2}21 cycle? c. 24\frac{2}{4}42 cycle? d. 111 full cycle?