Modern Physics 2 Question 17

16. Photoelectric effect experiments are performed using three different metal plates p,q and r having work functions φp=2.0eV,φq=2.5eV and φr=3.0eV, respectively. A light beam containing wavelengths of 550nm,450nm and 350 nm with equal intensities illuminates each of the plates. The correct IV graph for the experiment is

(2009)

(a)

(b)

(c)

(d)

Show Answer

Solution:

  1. E1=1240550=2.25eV,E2=1240450=2.75eV

E3=1240350=3.54eV

E1 cannot emit photoelectrons from q and r plates. E2 can not emit photoelectrons from r.

Further, work function of p is least and it can emit photoelectrons from all three wavelengths. Hence magnitude of its stopping potential and saturation current both will be maximum.



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक