1. What is Sound? Sound is a form of energy which produces a sensation of hearing in our ears. Sound is produced by vibrating objects. Examples include vibrating tuning fork, vocal cords in humans, bells, musical instruments, etc. Vibration: Rapid to-and-fro (back and forth) motion of an object. Short Question: Can sound be produced without vibration? Answer: No, sound cannot be produced without vibration. 2. Medium of Sound The substance through which sound travels is called a medium . Sound can travel through solids, liquids, and gases but cannot travel through vacuum . Process of Sound Propagation: When an object vibrates, it makes the air particles around it vibrate. These air particles move back and forth from their original (rest) position. The vibrating air particles push nearby air particles. This causes the nearby particles to also start vibrating. In this way, vibrations pass from one particle to another. This process continues through the medi...
Database A database is an organized collection of data stored electronically. It can store text, numbers, pictures, videos, and files. A software used to manage databases is called DBMS. Data and Information Data: Raw facts without meaning. Example: numbers, symbols. Information: Processed data that has meaning. Database and DBMS Database: Collection of logically related data stored in organized form. DBMS: Software used to create, update, and retrieve data. Examples: LibreOffice Base, MS Access, Oracle, MySQL Advantages of DBMS Organized storage Fast retrieval Data sharing Minimal data redundancy Data consistency Efficiency Accuracy Data validity Security Data Models A data model defines how data is stored and related in a database. Hierarchical Model Network Model Relational Model Hierarchical Model Data is arranged like a tree structure with parent-child relationships. Network Model A child can have multiple parents. More flexible than hie...