A) visible light
B) ultraviolet
C) infrared
D) X-ray
E) microwave
Correct Answer: D
Solution :
Energy of a photon, \[E=\frac{hc}{\lambda }\] \[\therefore \] Wavelength, \[\lambda =\frac{hc}{E}\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{13.2\times {{10}^{3}}\times 1.6\times {{10}^{-19}}}\] \[=0.9375\times {{10}^{-10}}m\] \[\approx 1\overset{\text{o}}{\mathop{\text{A}}}\,\] Wavelength range of X-rays is from \[{{10}^{-11}}m\] to \[{{10}^{-8}}m\] (0.1 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] to 100 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]). Therefore, the given electromagnetic radiation belongs to the X-ray region of electromagnetic spectrum.
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