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.
When to Begin House Training Puppy. Experts recommend that you begin house training your puppy when he is between 12 weeks and 16 weeks old. At that point, he has enough control of his bladder and bowel movements to learn to hold it.hen to Begin House Training Puppy. Experts recommend that you begin house training your puppy when he is between 12 weeks and 16 weeks old. At that point, he has enough control of his bladder and bowel movements to learn to hold it.