NEET Questions Solved

NEET - 2010

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200nm falls on it, must be

(a) 2.4 V

(b) -1.2 V

(c) -2.4 V

(d) 1.2 V

Energy of incident light E(eV)=123752000

=6.2eV (200 nm= 2000A)

According to the relation Ew + eV

        V=E-We

                =(6.2-5.01)ee

               =1.2 V

Difficulty Level:

  • 15%
  • 45%
  • 17%
  • 25%
Crack NEET with Online Course - Free Trial (Offer Valid Till August 23, 2019)