Threshold Frequency
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Q. when the light frequency 2vo(where vo is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1. when the frequency of the incident radiation is increased to 5vo, the maximum velocity of electrons emitted fromthe same platev2. the ratio of v1 to v2
Q. The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the intensity of the incident radiation.
Q.
The magnitude of photoelectric current depends on
Frequency of the radiation
Energy of the radiation
Intensity of the radiation
Wavelength of the radiation.
Q. Light of wavelength 2000 ˙A falls on a metallic surface whose work function is 4.2 eV. Calculate the stopping potential. (hc=12400 eV˙A)
- 12 V
- 2 V
- 3 V
- 6 V
Q. If a photocell is illuminated with a radiation of 1240 A∘, then stopping potential is found to be 8 V . The work function of the emitter and the threshold wavelength are
- 2 eV, 6200 ∘A
- 3 eV, 7200 ∘A
- 4 eV, 4200 ∘A
- 1 eV, 5200 ∘A
Q. A metal plate of area 1×10−4m2 is illuminated by a radiation of intensity 16 mW/m2 . The work function of the metal is 5 eV. The energy of the incident photons is 10 eV and only 10% of it produces photo electrons. The number of emitted photo electrons per second and their maximum energy respectively, will be
[1eV=1.6×10−19J]
[1eV=1.6×10−19J]
- 1014 and 10 eV
- 1012 and 5 eV
- 1011 and 5 eV
- 1010 and 5 eV
Q. In the experiment on photoelectric effect, the graph between Emax and v is found to be straight line as shown in figure.
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/504395/original_16.PNG)
The threshold frequency and Plancks constant according to this graph are
The threshold frequency and Plancks constant according to this graph are
- 2.66×1018 s−1, 4×10−34 Js
- 4×1018 s−1, 3×10−34 Js
- 3.33×1018 s−1, 6×10−34 Js
- 6×1018 s−1, 6×10−34 Js