1.

lamda_(1) and lamda_(2) are used to illuminate the slits, beta_(1) and beta_(2) are the corresponding fringe widths. The wavelength lamda_(1) cm produce photoelectric effect when incident on a metal. But the wavelength lamda_(2) cannot produce photoelectric effect. the correct relation between beta_(1) and beta_(2) is :

Answer»

`beta_(1)ltbeta_(2)`
`beta_(1)=beta_(2)`
`beta_(1)gtbeta_(2)`
`beta_(1)nebeta_(2)`

Solution :Fring width `beta prop lambda`. AS GIVEN that `lambda_(1)` PRODUCED photo ELECTRIC EFFECT, so `lambda_(1) lt lambda_(2)`
Hence, `beta_(1) lt beta_(2)`


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