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AP EAMCET2003ChemistryStructure of Atom

If the wavelength of an electromagnetic radiation is 2000 Ã… , what is its energy in ergs?

Options

  1. A9.94 10⁻¹²
  2. B9.94 10⁻¹⁹
  3. C4.97 10⁻¹²
  4. D4.97 10⁻¹⁹

Correct answer

A. 9.94 10⁻¹²

Step-by-step solution

E=h v, v= 3 10¹⁰ 2000 10⁻⁸ =1.5 10¹⁵ ⁻¹h=6.6 10⁻²⁷ erg sec E=h v=6.6 10⁻²⁷ 1.5 10¹⁵=9.94 10⁻¹² erg

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