Respuesta :
Copper and iron will not emit electrons when visible light shines on it
The electromagnetic spectrum includes the visible light spectrum, which spans from violet, which has the greatest frequency, to red, which has the lowest frequency. According to the relationship E = hf, where h is Planck's constant, the energy of a photon connected to an electromagnetic wave depends on the frequency f.
What is Work function ?
The amount of energy a photon needs to have in order to collide with an atom of the metal and evict an electron from it is determined by the metal's work function.
- The work functions of four metals are supplied to us in electron Volt units. According to internet documentation, a photon of light—specifically, a photon of ultraviolet light—can have a maximum energy of 3.1 eV.
- This suggests that when a photon of violet light is impacted on sodium or cesium, they can be made to eject an electron. However, the work functions of copper and iron are higher than the energy of violet light. Thus, it is impossible to induce them to emit electrons.
Learn more about Work function here:
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