Share to: It is our eyes that are capable of detecting a portion of the electromagnetic (EM) spectrum called visible light, or the optical spectrum.We describe the different frequencie â¦ s by color, with red being the lowest of the frequencies we can see.t is our eyes that are capable of detecting a portion of the electromagnetic (EM) spectrum called visible light, or the optical spectrum.
Young dogs can react unpredictably to electric dog fences, so understanding a puppy's development is essential to deciding when to start training the animal with the fence and collar. Generally, puppies should not be introduced to electric dog fences until they're at least four or five months old.
Young puppies have short attention spans but you can expect them to begin to learn simple obedience commands such as âsit,â âdown,â and âstay,â as young as 7 to 8 weeks of age. Formal dog training has traditionally been delayed until 6 months of age. Actually, this juvenile stage is a very poor time to start.