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

Question

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions Qs=2.0 eV , Qq=2.5 eV and Qr=3.0 eV, are respectively. A light beam containing wavelength of 550 nm , 450 nm and 350 nm 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)

Tardigrade Admin · Accepted Answer

Eλ1=550 nm =(1240/550) eV =2.25 eV Eλ2=450 nm =(1240/450) eV =2.8 eV Eλ3=350 nm =(1240/350) eV =3.5 eV From plate p, electrons are ejected by wavelengths 550 , 450 and 350 nm. From plate q, electrons are ejected by wavelengths 450 and 350 nm. From plate r, electrons are ejected by wavelength 350 .

Eλ1​​=550nm=5501240​eV=2.25eV Eλ2​​=450nm=4501240​eV=2.8eV Eλ3​​=350nm=3501240​eV=3.5eV From plate p, electrons are ejected by wavelengths 550,450 and 350nm. From plate q, electrons are ejected by wavelengths 450 and 350nm. From plate r, electrons are ejected by wavelength 350.