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.
Allergies happen when the bodyâs immune system responds to a substance that is foreign for instance pet dander, pollen or dust mites. The immune system triggers proteins referred to as antibodies. These antibodies protect the body from foreign invaders that would make the individual sick or create an infection.