alleryS۔ K۔ کولکتہ میں مترا کے 1920s کے ریڈیو تجربات نے کس ماحول کے علاقے کی جانچ کی؟
Aٹروپوسفیئر
Bآئونوسفیئر
Cاوزون کی تہہ
Dمیسوپاز
Answer & Solution
Correct answer: B. آئونوسفیئر
S۔ K۔ مترا نے ionosphere کو آواز دینے کے لیے زمین پر مبنی ریڈیو کا استعمال کیا، جو ہندوستانی خلائی تحقیق کا ایک ابتدائی قدم ہے۔
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