Work function of a material depends on

Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 14

If work function of target material is $2.34\mathrm{eV}$ and wavelength of incident light is $4.36\times {10}^{-7} \mathrm{m}$ then minimum potential required to stop the photo current is about $\left(h=6.6\times {10}^{-34}\mathrm{Js}\right)$

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 4

In photoelectric effect, if a weak intensity radiation instead of strong intensity of suitable frequency is used then

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 5

The work function of tungsten is $4.50 \mathrm{eV}.$ The wavelength of fastest electron emitted when light whose photon energy is $5.50 \mathrm{eV}$ falls on tungsten surface, is

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 6

A photosensitive metallic surface is illuminated alternately with lights of wavelength $3100 \mathrm{\AA }$ and $6200 \mathrm{\AA }.$ It is observed that maximum speeds of the photoelectrons in two cases are in ratio $2 : 1.$ The work function of the metal is $(hc=12400 \mathrm{eV\AA })$

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 8

The work function of a metallic surface is $5.01 \mathrm{eV}.$ The photo electrons are emitted when light of wavelength $2000 \mathrm{\AA }$ falls on it. The potential difference applied to stop the fastest photo electrons is $\left[h=4.14\times {10}^{-15} \mathrm{eV} \mathrm{s}\right]$

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 9

Assuming photo-emission to take place, the factor by which the maximum velocity of the emitted photo electrons changes when the wavelength of the incident radiation is increased four times, is (assuming work function to be negligible in comparison to $hc/\lambda$)

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 11

The work function of a certain metal is $2.3 \mathrm{eV}.$ If light of wave number $2\times {10}^6{ \mathrm{m}}^{-1}$ falls on it, the kinetic energies of fastest and slowest ejected electron will be respectively

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 13

Violet light is falling on a photosensitive material causing ejection of photoelectrons with maximum kinetic energy of $1 \mathrm{eV}.$ Red light falling on metal will cause emission of photoelectrons with maximum kinetic energy (approximately) equal to