Describe what happens to the speed, frequency, and wavelength of a 550Hz sound wave when it encounters a boundary between air and a solid wall? What wave behaviors might occur in this situation?

i need the answer to this too but idk it ; -;

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.