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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?
Wiki User
∙ 11y ago
Its because the electrons need a minimum amount of energy to come out of the material. This energy is called the threshold energy.
Wiki User
∙ 11y ago
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The frequency of visible light falls between that of?
Ultraviolet and the infrared.
Starburst galaxies are especially bright in visible light ultraviolet light or infrared light?
infrared light
Infrared rays have a shorter wavelength than ultraviolet rays?
No, Infra-red has a longer wavelength than Ultraviolet.
Which radiation energy from the sun can damage an organism?
Microwaves <><><><><> Ultraviolet, infrared, gamma.
Is infrared radiation more energetic than visible radiation?
No. Infrared (IR) light is longer wavelength (lower frequency) light and is of lower electromagnetic energy than shorter wavelength (higher frequency) ultraviolet (UV) light. Note that our skin "senses" infrared light (which we normally think of as heat) in a different way than it does ultraviolet light. This may account for the difference in the way it "feels" when we're exposed to light of the two energies. To be clear, ultraviolet light has higher energy photon for photon than infrared light. If both are absorbed by the skin, the reaction of the skin will be slightly different, but the energy imparted to the skin will be greater with the UV light that the IR light.
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.
Which has the higher frequencies ultraviolet or infrared?
Ultraviolet
What is similar about infrared and ultraviolet?
Both infrared and ultraviolet are kinds of electromagnetic radiation, as is the visible light.
Higher frequencies ultraviolet waves or infrared waves?
Ultraviolet is higher frequency, then visible light, then infrared.
Where is visible light along the EM spectrum?
Right between infrared and ultraviolet. It has higher frequencies than infrared; lower frequencies than ultraviolet.
What is the opposite of ultraviolet?
infrared
What has greater energy between ultraviolet and infrared?
ultraviolet has more energy.
The frequency of visible light falls between that of?
Ultraviolet and the infrared.
Which is the wavelenght that is nicknamed heat wave infrared or ultraviolet?
Heat is infrared radiation.
Are Infrared and Ultraviolet Light not visible?
Yes, they are not.
What are the invisible light?
Infrared and ultraviolet light
Which passes through glass without a problem infrared or ultraviolet radiation?
infrared radiation
