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Photoelectric effect experiments are per...

Photoelectric effect experiments are performed using three different metal plates `p,q` and`r` having work function `phi_(p) = 2.0 eV, phi_(e) = 2.5 eV and phi_(r) = 3.0 eV` respectively A light beam containing wavelength of `550nm , 450 nm` and `350nm ` with equal intensities illuminates each of the plates . The correct `I -V` graph for the experiment is [Take hc = 1240 eV nm]

A

B

C

D

Text Solution

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The correct Answer is:
A
`E_(1)=1240/550= 2.25 eV " " (lambda_(1)=550nm)`
`E_(2)=1240/450 = 2.27 eV " " (lambda_(2)=450 nm)`
`E_(3) = 1240/350 = 3.54 eV " " (lambda_(3)=350nm)`
For metal plate p : All the wavelengths are capable of ejecting electrons ` :. (phi_(p) = 2 eV)`
For metal plate q : `lambda_(2) and lambda_(3) ` are capable `(phi_(q) = 2.5 eV)`
For metal r : Only `lambda_(3)` will capable `(phi_(r )=3eV)`
` :." " KE_(p) gt KE_(q) gt KE_(r )`
and current is maximum for p and least for r .
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