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.
Low allergen or âhypoallergenicâ cats are known to produce fewer allergens than âregularâ cats. Note that the operative word here is âfewer.â Hypoallergenic is not synonymous with non-allergenic, and no breed is completely non-allergenic. The protein Fel D1 is the allergen in cat saliva that causes problems for allergy sufferers. Once a cat licks her coat, the allergen-laden spit dries and becomes airborne, seeking a warm home in your sinuses. Some cat breeds produce less of this protein than others, making them hypoallergenic.