Questions
A photoelectric surface is illuminated successively by monochromatic light of wavelength If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, c = speed of light)
detailed solution
Correct option is C
Let ϕ0 be the work function of the surface of the material. Then, According to Einstein's photoelectric equation, the maximum kinetic energy of the emitted photoelectrons in the first case isKmax1=hcλ-ϕ0and that in the second case isKmax2=hcλ2-ϕ0=2hcλ-ϕ0 But Kmax2=3Kmax1( given )∴ 2hcλ-ϕ0=3hcλ-ϕ02hcλ-ϕ0=3hcλ-3ϕ03ϕ0-ϕ0=3hcλ-2hcλ2ϕ0=hcλ or ϕ0=hc2λTalk to our academic expert!
Similar Questions
The work functions of three metals A,B and C are WA, WB and WC respectively. They are in the decreasing order. The correct graph between stopping potential V0 and frequency V of incident radiation is
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests