<p>In a photoelectric experiment, thresold wavelength of light of&nbsp; a metal is 380 nm. If wavelength of 280 nm is incidented on metal, the maximum kinetic energy of emitted electron will be:</p>

<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced open="[" close="]"><mrow><msub><mi>E</mi><mrow><mi>i</mi><msub><mi>n</mi><mrow><mi>e</mi><mi>V</mi></mrow></msub></mrow></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mfrac><mn>1237</mn><msub><mi>&#955;</mi><mrow><mo>(</mo><mi>i</mi><mi>n</mi><mo>&#160;</mo><mi>n</mi><mi>m</mi><mo>)</mo></mrow></msub></mfrac></mrow></mfenced></math></p>