A metal is illumimated by light of two different wavelength `248nm` and `310 nm` . The maximum speeds of the photoelectrons corresponding in these wavelength are `u_(1) and u_(2)` respectively . If the ratio `u_(1) : u_(2) = 2 : 1` and `hc = 1240 eVnm `, the work function of the meal is nearlyA. `3:7 eV`B. `3.2 eV`C. `2.8 eV`D. `2.5 eV`

A metal is illumimated by light of two different wavelength `248nm` an

1.	A metal is illumimated by light of two different wavelength `248nm` and `310 nm` . The maximum speeds of the photoelectrons corresponding in these wavelength are `u_(1) and u_(2)` respectively . If the ratio `u_(1) : u_(2) = 2 : 1` and `hc = 1240 eVnm `, the work function of the meal is nearlyA. `3:7 eV`B. `3.2 eV`C. `2.8 eV`D. `2.5 eV`
Answer» Correct Answer - A `248 nm=1240//248 ev-= 5ev` `310nm -=1240//310ev=4 ev` `(K.E_(1))/(K.E_(2))=(4)/(1)=(5ev-W)/(4ev-W)` `rArr 16-4W=S-W` `rArr11-3W` `rArrW=(11)/(3)=3.67 ev ~=3.7 ev`

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