railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Physics Wave

खालीलपैकी कोणत्या माध्यमातून ध्वनी सर्वात कमी वेगाने प्रवास करतो?

1
हवा
2
काच 
3
पाणी 
4
लाकूड 
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