ध्वनि का वेग अधिकतम होता है ? - What is the maximum speed of sound? - Dhwani Ka Veg AdhikTam Hota Hai ? General Science in hindi, Physics Vayu Me question answers in hindi pdf Para Me questions in hindi, Know About Jal Me General Science online test General Science notes in hindi quiz book Lohe Me
Beats can be heard when difference in frequencies is not more than