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Question

Physics Question on band theory of solids

The energy in monochromatic XX -rays of wavelength $1, ?? is roughly equal to

A

2×10−15J2 \times 10^{-15} J

B

2×10−16J2 \times 10^{-16} J

C

2×10−17J2 \times 10^{-17} J

D

2×10−18J2 \times 10^{-18} J

Answer

2×10−15J2 \times 10^{-15} J

Explanation

Solution

Energy E=hcλ=6.6×10−34×3×10810−10E =\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{10^{-10}} ≈2×10−15J\approx 2 \times 10^{-15} J