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?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

What is the role of lenses in microscopy?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?