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How many electrons are emitted when calcium is flashed with light of wavelength 340 nm and intensity of 50 percent?
5 electrons are emitted when calcium is flashed with light of wavelength 340 nm and intensity of 50 percent.
When the electrons of an excited atom return to a lower energy state the energy emitted can result in the production of what?
A photon of light.
Sodium is irradiated for 2 seconds with infrared light and no electrons are ejected The same metal is irradiated for 2 seconds with ultraviolet light and thousands of electrons are emitted?
Its because the electrons need a minimum amount of energy to come out of the material. This energy is called the threshold energy.
What happens when an electron return to its ground state?
Energy must be emitted for an electron to return to the ground state. This energy typically occurs in the form of a photon--a particle/wavelet of light. Flourescent bulbs, for example, conduct a current through a gas knocking electrons into higher, more exicted orbits. As the electrons decay into lower orbits, light is emitted, producing the flourescent glow.
When a clean surface of potassium metal is exposed to blue light electrons are emitted if the intensity of the blue light is increased what will also increase?
i have the same question on my test haha for me, the answers are: a) The number of electrons ejected per second b) the maximum kinetic energy of the ejected electrons c) the threshold frequency of the ejected electrons d) the time lag between the absorption of blue light and the start of emission of the electrons e) none of these A the number of electrons ejected per second,,,,, correct answer
Will exposure to red light cause electrons to be emitted from cesium?
No. It will not.
Will exposure to blue light cause electrons to be emitted from cesium?
No
How are electrons involved in light?
None, light is composed of photons. Light may be emitted or absorbed when electrons undergo transitions between atomic or molecular orbitals, but the light itself does not contain electrons.
How many electrons are emitted when calcium is flashed with light of wavelength 340 nm and intensity of 50 percent?
5 electrons are emitted when calcium is flashed with light of wavelength 340 nm and intensity of 50 percent.
What is photoelectronic?
when a light is shown on a material.Electrons emitted in this manner can be called photo-electrons
Are the electrons of an atom affected by temperature?
Temperature definitely affects the electrons of an atom, if the temperature is high enough. That is why fires produce light; the light you see from a fire is emitted by excited electrons.
Why calcium turns to red in the flame test?
Because, due to the absorption of heat energy by the calcium atom in the flame. The electrons in the atom get promoted to a higher energy level, and exist in an unstable excited state. As they are unstable and prefer to be at their normal ground state, the extra energy that the electrons absorbed to be promoted in the first place is emitted in the form of a photon, light. The light emitted from the electrons of the calcium atoms will be at a specific wavelength, which is the red light you see emitted from the flame. Because, due to the absorption of heat energy by the calcium atom in the flame. The electrons in the atom get promoted to a higher energy level, and exist in an unstable excited state. As they are unstable and prefer to be at their normal ground state, the extra energy that the electrons absorbed to be promoted in the first place is emitted in the form of a photon, light. The light emitted from the electrons of the calcium atoms will be at a specific wavelength, which is the red light you see emitted from the flame.
What is the relationship between the light emitted by an atom in the energies of the electrons in the atom?
The more energy levels the electron jumps the more energy the emitted light will have. The more energy you have the shorter wavelength there is.
What is the phenomenon in which electrons are emitted from a metals surface when light of a certain frequency shines on it?
Photoelectric phenomenon
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?
Much shorter wavelength in UV light, hence much greater energy.
One indicator that electrons in atoms are limited to specific energy levels is that?
light emitted from excited atoms occurs only at specific wavelengths
When the electrons of an excited atom return to a lower energy state the energy emitted can result in the production of what?
A photon of light.
