Mechanical waves require a medium to travel through. Examples of mechanical waves are sound waves, water waves, a vibrating string. (See related link). Electromagnetic waves â¦(such as light, radio waves, X-rays, microwaves) do not need a medium to travel through, so these are not mechanical waves.
Photostat definition, a camera for making facsimile copies of documents, drawings, etc., in the form of paper negatives on which the positions of lines, objects, etc., in the originals are maintained. a copy made with this camera.
Picasa is software developed by Google to manage digital images. A real benchmark in its field, it includes all the tools you need to manage your photo collections: the ability to import photos to your PC, as well as to organize, edit and share them with loved ones on Google platforms like Picasa Web or Google+ .nce your photos have been added to Picasa, they are organized into albums that will appear in folders with the same names from which they were taken. Then, you can reorganize and move photos from one location to another by simply dragging and dropping.