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1. बालू के एक कण की त्रिज्या 1.6 x 10-4मी है। इस कण की त्रिज्या
ऐंग्स्ट्रॉम में होगी
(a) 1.6x106A
तन (b) 1.5x106A
(c) 14x10A
(d)1.2x106A​