Exam

JEE Main

Year

2013

Date

9 April

Mode

Online

Subject

Physics

Chapter

Electromagnetic Waves

JEE Main 2013 · 9 April · Online · Physics · Electromagnetic Waves

Photons of an electromagnetic radiation has an energy 11 keV each....

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

Step-by-step solution

$\mathrm{E}=\frac{\mathrm{hc}}{\lambda} \Rightarrow \lambda=\frac{\mathrm{hc}}{\mathrm{E}}$ $\Rightarrow \lambda=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{11 \times 1000 \times 1.6 \times 10^{-19}}$ $=12.4 Å$
wavelength range of visible region is $4000 Å$ to $7800 Å$