Q-6 If a light with frequency 4 x 1...
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Q-6 If a light with frequency 4 x 1016 Hz emitted photoelectrons with double the kinetic energy as are emitted by the light of frequency 2.5 x 1016 Hz from the same metal surface, then what is the threshold frequency (no) of the metal ?

JEE/Engineering Exams
Physics
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( F_{k}+w=h v_{1}-0, v_{1}=2.5 times 10^{16}+1 z ) ( 2 E_{k}+w=h v_{2}-0, v_{2}=4 times 10^{16} mathrm{Hz} ) ó ( W=8 hleft(2 v_{1}-v_{2}right) ) ( =h(5-4) times 10^{16} mathrm{J} ) ( =6.62 times 10^{-3.4} cdot h times 10^{16} 5 ) Threshold frequenty, ( v_{0}=frac{11}{h}=10^{16} mathrm{Hz} )
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