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JEE Main 2013 (9 Apr, Shift 1) · Electromagnetic Spectrum & Atmosphere

Electromagnetic Spectrum & Atmosphere question from JEE Main 2013 (9 Apr, Shift 1)

Q30JEE Main 2013 · 9 APR · SHIFT 1Easy

Electromagnetic Spectrum & Atmosphere

Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?

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Answer: (a)

$\lambda (\text{Å}) = \dfrac{12400}{E(\text{eV})}$ .
$\lambda = \dfrac{12400}{11000} \approx 1.1\ \text{Å} \approx 0.11\ \text{nm}$ .
Wavelengths of about $0.01$ to $10\ \text{nm}$ are X-rays.
So the answer is (a) X-ray region.

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