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Why is it when sodium was irradiated for 2 seconds with infrared light no electrons were rejected but when it was irradiated with ultraviolet light thousands of electrons were emitted?
Infrared light does not have sufficient energy to remove electrons from the sodium atoms because the energy of the photons is too low. On the other hand, ultraviolet light carries enough energy to overcome the binding energy of the electrons in the sodium atoms, causing the emission of electrons via the photoelectric effect.
Why does helium have more emission lines than hydrogen?
Helium has more emission lines than hydrogen because it has more electrons and energy levels, leading to more possible transitions between these levels and the emission of different wavelengths of light.
What causes an emission when the SEM's primary electron beam bombards a specimen?
When the SEM's primary electron beam hits the specimen, it causes excitation of atoms in the specimen. This excitation leads to the emission of secondary electrons, backscattered electrons, characteristic X-rays, and Auger electrons, which are then detected by various detectors in the SEM for imaging and analysis.
What is the name of the range of colors emitted by a heated atom?
The name of the range of colors emitted by a heated (energized, excited, etc...) atom is called an emission spectrum.
Why do the emission spectra for hydrogen and helium differ?
The emission spectra for hydrogen and helium differ because each element has a unique arrangement of electrons in their atoms. This arrangement causes them to emit different wavelengths of light when excited, resulting in distinct spectral lines.
What is the difference between field emission and photoelectric emission?
* emisssion of electron from the surface of the metal when light of suitable frequency falls-photoelectric emission. * emision of electron from the metal by quantum tunnling of electron.
What is the emission of electrons from a metals surface when light of a certain frequency shines on it?
photoelectric effect
How does increasing the frequency of light in the photoelectric effect impact the emission of electrons?
Increasing the frequency of light in the photoelectric effect results in the emission of electrons with higher energy levels. This is because higher frequency light carries more energy, which allows electrons to be ejected from the material with greater kinetic energy.
What is photoelectric emission effect?
The photoelectric emission effect is a phenomenon where electrons are emitted from a material when it is exposed to light, typically of high enough frequency (i.e., energy) to cause electrons to be ejected from the material's surface. This effect is important in technologies like solar cells and photomultiplier tubes.
What are the Differences between thermionic emission and photoelectric emission?
Electrons would have enough energy to leave the metal surface, the hot cathode. However, without the forward voltage bias, positive anode. The vacuum diode could not conduct electricity. In other words, the initial kinetic energy of the emitted electrons can be ignored [0 J].Whereas, the photo-emitted electrons possess definite amount of initial kinetic energy.K.E. of e = hf - WorkFunctionSee, the initial k.e. is not neglectable.
What produces electrons?
Electrons are produced by various processes, including photoelectric effect, thermal emission, field emission, and radioactive decay. In materials, electrons can also be generated by chemical reactions or through the application of electric fields.
In the photoelectric what happens when light hits the metal?
electrons are knocked off atoms causing electricity to flow
What is the stopping potential formula used to calculate the minimum voltage required to stop the emission of electrons in a photoelectric experiment?
The stopping potential formula is V hf/e, where V is the stopping potential, h is the Planck constant, f is the frequency of the incident light, and e is the elementary charge. This formula is used to calculate the minimum voltage needed to stop the emission of electrons in a photoelectric experiment.
Is reverse process of photoelectric effect is zeeman effect?
No, the reverse process of the photoelectric effect is not the Zeeman effect. The Zeeman effect is the splitting of spectral lines in the presence of a magnetic field, while the photoelectric effect is the emission of electrons from a material when exposed to light. They are two distinct phenomena in physics.
Why are photoelectric measurement so sensitive to the nature of the photoelectric surface?
why are photoelectric measurements are so sensitive to the nature of the photoelectric surface
Which of the following modern technologies makes use of the photoelectric effect?
Solar panels make use of the photoelectric effect to convert sunlight into electricity. The photoelectric effect is responsible for generating the flow of electrons within the solar cells when photons of light strike the panels.
What is threshold wavelength?
Threshold wavelength refers to the minimum wavelength of light required to start a specific phenomenon, such as photoelectric effect or emission of electrons from a metal surface. Below this threshold wavelength, the desired effect does not occur.
