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If the wavelength of an electromagnetic radiation is $2000 Å$, what is its energy in ergs?
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The correct answer is:
$9.94 \times 10^{-12}$
$E=h v, v=\frac{3 \times 10^{10}}{2000 \times 10^{-8}}=1.5 \times 10^{15} \sec ^{-1}$
$h=6.6 \times 10^{-27}$ erg sec
$E=h v=6.6 \times 10^{-27} \times 1.5 \times 10^{15}=9.94 \times 10^{-12} \mathrm{erg}$
$h=6.6 \times 10^{-27}$ erg sec
$E=h v=6.6 \times 10^{-27} \times 1.5 \times 10^{15}=9.94 \times 10^{-12} \mathrm{erg}$
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