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Light Emitting Diode

86.Work funct...

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86.Work function of Zn is 3.74eV. If the sphere of Zn is illuminated by the X rays of wavelength 12angstroms,find the maximum potential production on the sphere ,h =6.625\ast10^{-34} Js

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Q. Work function of Zn is

3.74

eV. If the sphere of Zn is illuminated by the X-rays of wavelength

12 o A

, find the maximum potential production on the sphere,

h = 6.625 \times 10^{- 34}

The work function of a metal is $1.6 \times 10^{- 19} J$ . When the metal surface is illuminated by the light of wavelength $6400 \circ A$ , then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant $h = 6.4 \times 10^{- 34} J s$ )

Q. The work function of a metal is

1.6 \times 10^{- 19}

J. When the metal surface is illuminated by the light of wavelength 6400

A^{o}

, then the maximum kinetic energy of emitted photoelectrons will be (

h = 6.4 \times 10^{- 34} J s

)

Q. The work function of Potassium is

2.0 e V

. When it is illuminated by light of wavelength

3300

A^{o}

, photoelectrons are emitted. The stopping potential of photoelectrons is :

[

h = 6.6 \times 10^{- 34} J s, 1 e V = 1.6 \times 10^{- 19} J

, Velocity of light,

c = 3 \times 10^{8} m s^{- 1}

]

Q. The work function of a metal is 3.0eV. It is illuminated by a light of wave length

3 \times 10^{- 7} m

. then
i) Threshold frequency
ii) maximum energy of photoelectrons,
iii) the stopping potential.

h = 6.63 \times 10^{- 34} m

c = 3 \times 10^{8} m / s

)

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