ध्वनि की चाल सबसे अधिक किसमें होती है?

उत्तर: (C) Steel — Sound travels fastest in solids (steel ~5960 m/s), slower in liquids (water ~1500 m/s), slowest in gases (air ~343 m/s at 20°C). Sound cannot travel in vacuum. Denser medium = faster sound.