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.
Typically, since colds and allergies share similar symptoms and treatments, itâs hard to spot the difference. Unlike allergies, the common cold is caused by a virus, while allergy symptoms are a result of immune system responses to allergens like pollen, dust, or even pet dander, says the Mayo Clinic.