defence exam BSF Head Constable (RO/RM) Mock Test 2023 Physics Atoms X Rays and the Ordering of the Elements

निम्नलिखित में से कौन-सा तरंगदैर्ध्य, एक्स-रे के तरंगदैर्ध्य के तुल्य होता है? 

1
500 nm
2
5000 nm
3
100 nm
4
1 nm
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