A physicist wishes to eject electrons by shining light on a metal surfac. The light source emits light of wavelenght of 450 nm. The table lists the only available metals and their work functions. `{:("Metal",W_(0)(eV)),("Barium",2.5),("Lithium",2.3),("Tantalum",4.2),("Tungsten",4.5):}` Suppose photoelectric experiment is done separately with these metals with light of wavelenght 450 nm. The maximum magnitude of stopping potential amongst all the metals. is-A. `2.75 "volt"`B. `4.5 "volt"`C. `0.45 "volt"`D. `0.25 "volt"`

A physicist wishes to eject electrons by shining light on a metal surf

1.	A physicist wishes to eject electrons by shining light on a metal surfac. The light source emits light of wavelenght of 450 nm. The table lists the only available metals and their work functions. `{:("Metal",W_(0)(eV)),("Barium",2.5),("Lithium",2.3),("Tantalum",4.2),("Tungsten",4.5):}` Suppose photoelectric experiment is done separately with these metals with light of wavelenght 450 nm. The maximum magnitude of stopping potential amongst all the metals. is-A. `2.75 "volt"`B. `4.5 "volt"`C. `0.45 "volt"`D. `0.25 "volt"`
Answer» Correct Answer - C The maximum magnitude of stopping potential will be for metal of least work function. `:.` required stopping potential is `V_(s)=(hv-phi_(0))/(e )=0.45 "volt"`

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