Why does a node in a standing wave have zero displacement?

Which describe reflection? check all that apply. light bounces off a boundary.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water