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.
What is a PSD file? The .psd file extension is given to files that have been created by the Adobe Photoshop computer application. The Adobe Photoshop application is a professional image-editing program that can create a variety of image elements such as layers and masks. When these files are created, they are saved with the .psd file extension. Adobe Photoshop is one of the most commonly-used image editing applications on the market and it is very popular among desktop publishers and image editors.