Parashravy Tarangon Ko Sabse Kisne Seeti Bajakar Utpann Kiya Tha ? पराश्रव्य तरंगों को सबसे किसने सीटी बजाकर उत्पन्न किया था ?
पराश्रव्य तरंगों को सबसे किसने सीटी बजाकर उत्पन्न किया था ?
Comments Bala on 05-04-2023 Ayush raj on 20-09-2022
पराश्रव्य तरंग को सबसे पहले किसने सीटी बजाकर उत्पान्न किया
Parakshravay tarango ko sabse pahle kisne seeti bajakar uttapann kiya tha?
Maya on 30-07-2021
Parakshravay tarango ko sabse pahle kisne seeti bajakar uttapann kiya tha?
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