Structure of Atom - Result Question 1
####1. Calculate the energy in joule corresponding to light of wavelength $45 nm$ :
(Planck’s constant $h=6.63 \times 10^{-34} Js$; speed of light $c=3 \times 10^{8} ms^{-1}$ )
(a) $6.67 \times 10^{15}$
(b) $6.67 \times 10^{11}$
(c) $4.42 \times 10^{-15}$
(d) $4.42 \times 10^{-18}$
[2014]
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Solution:
- (d) $E=\frac{h c}{\lambda}=\frac{6.63 \times 10^{-34} \times 3 \times 10^{8}}{45 \times 10^{-9}}$
$=4.42 \times 10^{-18} J$
