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.
Allergic disease can develop at any age, and heredity plays a key role in who will develop it. If one parent has allergic disease, the estimated risk of the child to develop allergies is 48% and the childâs risk grows to 70% if both parents have allergies. Symptoms of allergic disease are the result of events occurring within your immune system, the bodys defense mechanism against harmful substances.