Question
A photon of wavelength 3000 Ã… strikes a metal surface. The work function of the metal is 2.13 eV. What is the kinetic energy of the emitted photoelectron? ( h =6.626 10^ -34 Js )
BITSAT
Chemistry
Structure of Atom
2024
BITSAT 2024 (Memory Based Paper 1)
BITSAT Chemistry Question (2024) — Solution
Options
- A. 4.0 eV
- B. 3.0 eV
- C. 2.0 eV
- D. 1.0 eV
Answer
C. 2.0 eV
Step-by-step solution
=3000 Ã…=3 10^ -7 ~m , =2.13 eV K.E. =h v-h v_0=h v- = h c - = (6.626 10^ -34 3 10^8 ) 3 10^ -7 - (2.13 1.6 10^ -19 ) = 1.98 10^ -25 3 10^ -7 - (3.408 10^ -19 ) = (6.60 10^ -19 )- (3.408 10^ -19 ) =3.192 10^ -19 ~J =2.0 eV
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