Question 154 of 165

Photons of an electromagnetic radiation has an energy $11 \mathrm{keV}$ each. To which region of electromagnetic spectrum does it belong ?

AX-ray regionBUltra violet regionCInfrared regionDVisible region

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Answer: (A) X-ray region

$\mathrm{E}=\frac{\mathrm{hc}}{\lambda} \Rightarrow \lambda=\frac{\mathrm{hc}}{\mathrm{E}}$
$\Rightarrow \lambda=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{11 \times 1000 \times 1.6 \times 10^{-19}}$
$=12.4 Å$


wavelength range of visible region is $4000 Å$ to $7800 Å$

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