Sound wave for upsc , pcs , ssc cgl in Hindi | crash course of general science part 19 | physics

today we are going to learn 19th part of physics. which is important series of crash course of general science in hindi language. आधुनिक भारत का इतिहास full series /playlist/PL1IsUBo6PRFc1q41h4LFP9wgJsO778Df1 .................................................................................. our official Facebook page https://www.facebook.com/shrieducation/

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