The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is

<p>Using Bohr’s theory :</p><p><math><mrow><mi>λ</mi><mo>=</mo><mfrac><mrow><mi>h</mi><mi>c</mi></mrow><mrow><msub><mrow><mi>E</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>−</mo><msub><mrow><mi>E</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>1</mn><mn>2</mn><mn>4</mn><mn>2</mn><mi>e</mi><mi>V</mi><mo>−</mo><mi>n</mi><mi>m</mi></mrow><mrow><mrow><mo> (</mo><mrow><mo>−</mo><mn>3</mn><mo>.</mo><mn>4</mn></mrow><mo>)</mo></mrow><mo>−</mo><mrow><mo> (</mo><mrow><mo>−</mo><mn>1</mn><mn>3</mn><mo>.</mo><mn>6</mn></mrow><mo>)</mo></mrow></mrow></mfrac><mo>=</mo><mn>1</mn><mn>2</mn><mn>1</mn><mo>.</mo><mn>8</mn><mi>n</mi><mi>m</mi></mrow></math></p>

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