Examples of reflection. Plane wave, plane surface. The phase of the reflected sound waves from hard surfaces and the reflection of string waves from their ends determines whether the interference of the reflected and incident waves will be constructive or destructive.
The tendency to develop allergies is often hereditary, which means it can be passed down through genes from parents to their kids. But just because you, your partner, or one of your children might have allergies doesn't mean that all of your kids will definitely get them, too.
Lifestyle Changes. People with existing allergies should avoid irritants or allergens. These triggers include: 1  Pollen. 2  This is the primary cause of allergic rhinitis. 3  Dust mites, specifically mite feces, which are coated with enzymes that contain a powerful allergen. 4  These are the primary allergens inside the home.