Sit. Rep. #74: Electromagnetic radiation.

1- Light is part of the electromagnetic spectrum.  Also called electromagnetic radiation.  In Ham Radio we call it RF – short for Radio Frequency.  The electromagnetic spectrum is broadly divided into 7 different parts depending on the wavelength of the radiation.   Remember that the frequency and the wavelength are directly but inversely related.   So we … Read more

Sit. Rep. #51: Sign Posts in the Water

1- As we prepare for the canoe trips we must learn to read the river signs.  So – first – new words:    Eddy: The swirling of water (horizontal to stream surface) just downstream of an obstacle that causes the current to flow backward (upstream) to fill the void behind the obstacle.  You can get … Read more