railway RRB Junior Stenographer (Ministerial and Isolated Categories) Mock Test General Science Physics Wave

কোন গতিবেগ বায়ুতে শব্দের গতিবেগের চেয়ে বেশি?

1
সুপারসনিক 
2
সৌর 
3
শব্দেত্তর 
4
অতিস্বনক 
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