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.
1 Allergens are substances that are foreign to the body and that cause an allergic reaction. 2  IgE is the allergic antibody. 3  Although many individuals outgrow allergies over time, allergies can also develop at any age, including during adulthood.