A light source of 32 watt emits light of λ = 620 nm . If all the emitted photons are made to strike a metal plate of work function = 1.5 eV . Then the magnitude of photocurrent (in ampere) will be ___

Question

A light source of 32 watt emits light of $λ = 620 nm$ . If all the emitted photons are made to strike a metal plate of work function $= 1.5 eV$ . Then the magnitude of photocurrent (in ampere) will be $____$ .

[Assume that 50% of the incident photons eject photoelectrons and sufficient accelerating potential difference has been applied].

(e = 1.6 × 10^-19Coulomb)

TestHub · Accepted Answer

Energy of one photon = 2 eV . R a t e o f p h o t o n e mi ss i o n N u mb er o f e l ec t ro n s e mi tt e d p er seco n d P h o t oc u rre n t ​ = 2 × 1.6 × 1 0 − 19 32 ​ = 1 0 20 = 2 1 ​ × 1 0 20 = 2 1 ​ × 1 0 20 × 1.6 × 1 0 − 19 = 8 ​

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