Em Waves Question 119
Question: An electromagnetic radiation has an energy 11 keV. To which region of electromagnetic spectrum does it belong?
Options:
A) X-ray region
B) Ultra violet region
C) Infrared region
D) Visible region
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ E=\frac{hc}{\lambda }\Rightarrow \lambda =\frac{hc}{E} $
$ \Rightarrow \lambda =\frac{6.6\times {{10}^{-34}}\times 3\times 10^{8}}{11\times 1000\times 1.6\times {{10}^{-19}}}=12.4\overset{o}{\mathop{A}}, $ Wavelength range of visible region is $ 4000\overset{o}{\mathop{A}}, $ to $ 7800\overset{o}{\mathop{A}}, $ .
BETA
