Three laser guns labelled as I,II&III have power 2 watt, 3watt and 5 watt (not necessarily in same order) are used to produce photocurrent from nmental plate as show in diagram. Number of photons emitted by laser guns are `4xx10^(18),5xx10^(18)` and `9xx10^(18)` per sec. metal plante have thershold energy `4.5` `xx10^(-19)` J. Neither the power nor the number of photon emitted b a particlar laser gun is known and it is know that call all capable emits a photonelectron. A. `(5)/(4)`B. `(9)/(5)`C. `(9)/(4)`D. `(9)/(2)`

Three laser guns labelled as I,II&III have power 2 watt, 3watt and 5 w

1.	Three laser guns labelled as I,II&III have power 2 watt, 3watt and 5 watt (not necessarily in same order) are used to produce photocurrent from nmental plate as show in diagram. Number of photons emitted by laser guns are `4xx10^(18),5xx10^(18)` and `9xx10^(18)` per sec. metal plante have thershold energy `4.5` `xx10^(-19)` J. Neither the power nor the number of photon emitted b a particlar laser gun is known and it is know that call all capable emits a photonelectron. A. `(5)/(4)`B. `(9)/(5)`C. `(9)/(4)`D. `(9)/(2)`
Answer» Correct Answer - D For maxiumum photocurrent the combination is as follows (a) 2 watt `rArr 4xx10^(18)` photons/sec. ltbgt (b) 3 watt `rArr 5xx10^(18)` photons/sec. (c) 5 watt `rArr 9xx10^(18)` photons /sec. photoelectrons will be emitted from comcination (a),(b)and(c) all `therefore` Photocurrent =`(4+5+9)xx10^(18)xx1.6xx10^(-19)` Amp =2.88 ` therefore` Ratio`=(92.88)/(0.64)=4.5(18)/(4)rArr(9)/(2) `

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