Any metal contains positive ions & free electrons which can move around inside the metal but can not leave it due to the attractive forces of the surface which may be represented by a...
Long time ago man was asking about the nature of matter and its structure , while the trials done by the scientists to answer this question across different eras , the concept of the...
Light is an essential form of energy , The Sun is the most important source of light energy , It is the main natural source , It gives us heat & light , where...
