Questions in Dual Nature of Radiation and Matter

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A photo cell is receiving light from a source placed at a distance of 1 m. If the same source is to be placed at a distance of 2 m, then the ejected electron
In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be
Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wave length of photo – electrons is 5420 Å. The work function of sodium is
Photo cell is a device to
If the work function for a certain metal is $3.2 \times {10^{ - 19}}$joule and it is illuminated with light of frequency $8 \times {10^{14}}$Hz. The maximum kinetic energy of the photo-electrons would be
Stopping potential for photoelectrons
The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be
When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be
The minimum energy required to remove an electron is called
Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2V potential stops the emitted electrons. The work function of the material (in eV) is approximately $(h = 6.6 \times {10^{ - 34}}Js,\;\;e = 1.6 \times {10^{ - 19}}C,\;\;c = 3 \times {10^8}m{s^{ - 1}})$

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