Question

Calculate the energy associated with photon of light having a wavelength 6000 $\stackrel{o}{A}$. [h= $6.626\times {10}^{-27}ergs$]

• A. $3.313\times {10}^{-11}erg$
• B. $3.313\times {10}^{-12}erg$
• C. $3.313\times {10}^{-13}erg$
• D. $3.313\times {10}^{-10}erg$

Answer 1

The correct option is B $3.313\times {10}^{-12}erg$

We know that:
$E=hv=\frac{hc}{\lambda }$
$h=6.626\times {10}^{-27}erg.s$
$c=3\times {10}^{10}cm/s$
$\lambda =6000\stackrel{o}{A}$ = $6\times {10}^{-5}cm$
$E=\frac{(6.626\times {10}^{-27})\times (3\times {10}^{10})}{6\times {10}^{-5}}=3.313\times {10}^{-12}erg$