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The photoelectric emission requires a th...

The photoelectric emission requires a threshold frequency ` v_0` . For a certian metal ` lambda _1 = 2200 Å` and ` lambda _2 = 1900 Å ` produce electrons with a maximum kinetic enrgy ` KE_1` and ` KE_2`, if ` KE_2= 2KE_1`, calculate ` v_0` and corresponding ` lambda _0`,

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`v_0 = 1.2 483 xx 10^(15) sec^(-1) , lambda_0 = 2612,6Å ,`
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