ChemistryThe energy of a photon is 3×10 –12 ergs. What is its wavelength in nm ? (h= 6.62 × 10 –27 erg. sec; C=3×10 10 cm.s –1 )

The energy of a photon is 3×10–12 ergs. What is its wavelength in nm ? (h= 6.62 × 10–27 erg. sec; C=3×1010cm.s–1)

  1. A
    662
  2. B
    1324
  3. C
    66.2
  4. D
    6.62

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    Solution:

    large E = frac{{hc}}{lambda } = frac{{left( {6.625 times {{10}^{ - 24}}ergs.sec } right)left( {3 times {{10}^{10}}cm/s} right)}}{{lambda left( {in{text{ }}cm} right)}}

    large lambda left( {in{text{ }}cm} right) = frac{{left( {6.625 times {{10}^{ - 27}}ergs.sec } right)left( {3 times {{10}^{10}}cm/s} right)}}{{left( {3 times {{10}^{ - 12}}ergs} right)}}

                             = 6.625 × 10-5 cm

                             = large frac{{6.625 times {{10}^{ - 5}} times {{10}^{ - 2}}}}{{{{10}^{ - 2}}}}nm

                             = 662.5 nm

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