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.
An allergy is the immune systemâs response to a foreign substance thatâs not typically harmful to your body. These foreign substances are called allergens. They can include certain foods, pollen, or pet dander.They elicit a response from your immune system.Your immune systemâs job is to keep you healthy by fighting infection and other harmful pathogens.hese foreign substances are called allergens. They can include certain foods, pollen, or pet dander. They elicit a response from your immune system. Your immune systemâs job is to keep you healthy by fighting infection and other harmful pathogens.