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The energy of a photon is $3 \times 10^{-12}$ ergs. What is its wavelength in nm? $(h= 6.62 \times 10^{-27} ergs, c=3 \times 10^{10}cm/s)$

\[\begin {array} {1 1} (a)\;662 & \quad (b)\;1324 \\ (c)\;66.2 & \quad (d)\;6.62 \end {array}\]
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(a) 662
answered Nov 7, 2013 by pady_1

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