1.

The energy in monochromatic X-rays of wavelength 1 A is roughly equal to

A. \[2\times {{10}^{-15}}J\]
B. \[2\times {{10}^{-16}}J\]
C. \[2\times {{10}^{-17}}J\]
D. \[2\times {{10}^{-18}}J\]
Answer» B. \[2\times {{10}^{-16}}J\]


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