Home
Class 12
PHYSICS
The threshold wavelength for a metal sur...

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is……………………

A

4125 `Å`

B

3750 `Å`

C

6000 `Å`

D

2062.5 `Å`

Text Solution

Verified by Experts

The correct Answer is:
B
`phi = h upsilon_(0) rArr phi = (hc)/(lambda_(0))`
`therefore lambda_(0) = (hc)/(phi) = (6.6 xx 10^(-34) xx 3 xx 10^(8))/(3.313 xx 1.6 xx 10^(-19)) = 3.7352 xx 10^(-7)`
`= 3.740 xx 10^(-7) rArr lambda_(0) rArr lambda_(0) ~~ 3740 Å`
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise TEXTUAL EVALUATION SOLVED -( SHORT ANSWER QUESTIONS)|14 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise TEXTUAL EVALUATION SOLVED -( LONG ANSWER QUESTIONS)|13 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise ADDITIONAL QUESTIONS -( ADDITIONAL NUMERICAL PROBLEMS : )|10 Videos

  • CURRENT ELECTRICITY

    FULL MARKS|Exercise Additional Questions Solved (Numerical Problems)|6 Videos

  • ELECTROSTATICS

    FULL MARKS|Exercise ADDITIONAL QUESTIONS SOLVED ( VII. NUMERICAL PROBLEMS )|5 Videos

Similar Questions

Explore conceptually related problems

The threshold wavelength for a metal surface whose photoelectric work function is 3.313eV is

If the threshold wavelength for a certain metal 3000Å , then the work function of the metal is

Light of wavelength 5000Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The K.E. of the photo electron emitted will be

A certain metallic surface is illuminated with manochromatic light of wavelength , lambda . The stopping potential for photoelectric current for this light is 3V_0 . If the same surface is illuminated with light of wavelength 2lambda , the stopping potential is V_0 . The threshold wavelength for this surface for photoelectric effect is:

A light of wavelength 500 nm is incident on a sensitive plate of photoelectric work function 1.235 eV. The kinetic energy of the photo electrons emitted is be (Take h = 6.6 xx 10^(-34) Js)