Advertisements
Advertisements
Question
Give an example each of a metal from which photoelectric emission takes place when irradiated by
- UV light
- visible light.
Advertisements
Solution
- Photoelectric emission takes place when Zn is irradiated with UV radiation.
- Photoelectric emission takes place when Na is irradiated with visible light.
APPEARS IN
RELATED QUESTIONS
Find the maximum frequency of X-rays produced by 30 kV electrons.
Find the (a) maximum frequency and (b) minimum wavelength of X-rays produced by 30 kV electrons.
Quarks inside protons and neutrons are thought to carry fractional charges [(+2/3)e; (–1/3)e]. Why do they not show up in Millikan’s oil-drop experiment?
Why should gases be insulators at ordinary pressures and start conducting at very low pressures?
The work function of the following metals is given : Na 2.75 ev, K = 2.3 eV, Mo = 4.17 eV and Ni = 5.15 eV. Which of these metals will not cause photoelectric emission for radiation of wavelength 3300 Å from a laser source placed 1 m away from these metals? What happens if the laser source is brought nearer and placed 50 cm away?
Would you prefer a material with a high work-function or a low work-function to be used as a cathode in a diode?
Why does thermionic emission not take place in non-conductors?
The wavelength λe of an electron and λp of a photon of same energy E are related by ______.
If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the wave associated with the emitted electron is (Take h = 6.6 × 10–34 Js)
In which case is electron emission from a metal not known?
