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.
The most common allergens are dust, pollen, animal dander, mold, insect stings, certain foods, medications and latex. Allergies & Fatigue. In his article âMolds, Mites, and Pollens: Common Causes of Allergic Fatigue,â Ronald Hoffman, M.D., says âover twenty million Americans suffer from hay fever. About ten million are victims of asthma, and another eleven million suffer from skin disorders like eczema, hives, and rashes.