1.

In an experiment on photoelectric effect the stopping potentail was measured to be V_(1) and V_(2) with incident light of wavelength lambda and (lambda)/(2) respectively.The relation between V_(1) and V_(2) is….

Answer»

`V_(2)gt2V_(1)`
`V_(2)ltV_(1)`
`V_(2)ltV_(2)lt2V_(1)`
`V_(2)=2V_(1)`

Solution :`V_(1)=(hc)/(elambda)-(PHI)/(E )implies(hc)/(elambda)=V_(1)+(phi)/(e)implies(2hc)/(elambda)=2V_(1)+(2phi)/(e )`
`V_(2)=(2hc)/(elambda)-(phi)/(e )-(2hc)/(elambda)=V_(2)+(phi)/(e )`……(2)
Equation (1) and (2) are same .
`therefore V_(2)+(phi)/(e )=2V_(1)+(2phi)/(e )`
`therefore V_(2)=2V_(1)+(phi)/(e)`
`therefore V_(2)gt2V_(1)`


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