Light of two different frequencies whose photons have energies 1 eV and 2.5 eV , respectively, successively illum inate a metal whose work function is 0.5 eV . The ratio of the maximum speed of the em

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Light of two different frequencies whose photons have energies 1 eV and 2.5 eV , respectively, successively illum inate a metal whose work function is 0.5 eV . The ratio of the maximum speed of the emitted electrons will be

TestHub · Accepted Answer

If E is the energy of incident photon and W 0 ​ the work function, then Available energy = E − W 0 ​ E − W 0 ​ = 2 1 ​ m v 2 v = m 2 ( E − W 0 ​ ) ​ ​ v 2 ​ v 1 ​ ​ = 2.5 − 0.5 1 − 0.5 ​ ​ = 2 1 ​ ​

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