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Questions  >>  CBSE XII  >>  Physics  >>  Electromagnetic waves
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Q)

A light have a wavelength of $6000^{\circ} A $ What is the energy of this light

$\begin{array}{1 1} 5\;ev \\ 2.07\;ev \\ 1.07\;ev \\ 0.207\;ev \end{array} $

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A)
Solution :
$E=\large\frac{hc}{\lambda}$
$\qquad= \large\frac{6.63 \times 10^{-34} \times 3 \times 10^8}{6 \times 10^5 \times 1.6 \times 10^{-19}}$
$\qquad= 2.07\;ev$
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