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.
Prevention of Allergies and Asthma in Children. This article has been reviewed by Thanai Pongdee, MD, FAAAAI. It has long been known that allergies and asthma tend to run in families, making children where one or both parents have an allergic disease more likely to develop these conditions.