The energy required to remove an electron from the surface of Sodium metal is 2.3 eV. What is the longest wavelength of radiation with which it can show photoelectric effect?

Question

The energy required to remove an electron from the surface of Sodium metal is 2.3 eV. What is the longest wavelength of radiation with which it can show photoelectric effect? (A) 5.4× 10- 17 m (B) 5.4× 10- 8 m (C) 5.4× 10- 7 m (D) 5.4× 10- 9 m

Tardigrade Admin · Accepted Answer

Energy required to show photo emission =2.3 eV =2.3 × 1.6× 10- 19 J Thus E = (h c/λ ) or λ =(h c/E)=(6.626 × 10- 34 × 3 × 108/2.3 × 1.6 × 10- 19) = 5.4 × 10- 7 m. Thus, longest wavelength to show photoelectric effect =5.4 × 10- 7 m.

Q. The energy required to remove an electron from the surface of Sodium metal is $2.3 e V .$ What is the longest wavelength of radiation with which it can show photoelectric effect?

$5.4 \times 1 0^{- 17} m$

$5.4 \times 1 0^{- 8} m$

$5.4 \times 1 0^{- 7} m$

$5.4 \times 1 0^{- 9} m$

Q. The energy required to remove an electron from the surface of Sodium metal is 2.3eV. What is the longest wavelength of radiation with which it can show photoelectric effect?

5.4×10−17m

5.4×10−8m

5.4×10−7m

5.4×10−9m

Energy required to show photo emission =2.3eV =2.3×1.6×10−19J Thus E=λhc​orλ=Ehc​=2.3×1.6×10−196.626×10−34×3×108​ =5.4×10−7m. Thus, longest wavelength to show photoelectric effect =5.4×10−7m.

Q. The energy required to remove an electron from the surface of Sodium metal is $2.3 e V .$ What is the longest wavelength of radiation with which it can show photoelectric effect?

$5.4 \times 1 0^{- 17} m$

$5.4 \times 1 0^{- 8} m$

$5.4 \times 1 0^{- 7} m$

$5.4 \times 1 0^{- 9} m$