दूरसंचार कथा : मोहन सुंदर राजन द्वारा हिंदी पीडीऍफ़ पुस्तक – सामाजिक | Doorsanchar Katha : by Mohan Sundar Rajan Hindi PDF Book – Social (Samajik)
Pustak Ka Vivaran : Dhvani ne Anadikal se hi manushy ke man ko lubhaya hai. Phir bhi, dhvani tarangon ki prakrti, vaigyanik taur par to keval atharahaveen shatabdi se hi samajhee ja saki hai. Vastav mein, teliphone shabd (Eunani shabd telee arthat door” tatha phon arthat dhvani se bana hai) ka arth tha-sanchar ki dhvani pranali. Yah to bad ki bat hai ki yah shabd……..
Description about eBook : ‘Sound’ has wooed the human mind since time immemorial. Nevertheless, the nature of sound waves can only be understood scientifically from the eighteenth century. In fact, the word ‘telephone’ (derived from the Greek word ‘tele’ meaning ‘far “and’ phone ‘meaning’ sound ‘) meant – the sound system of communication. It is later that this word ……..
