91影视

Violet light of wavelength \({\rm{400 nm}}\) ejects electrons with a maximum kinetic energy of \({\rm{0}}{\rm{.860 eV}}\) from sodium metal. What is the binding energy of electrons to sodium metal?

Question: Violet light of wavelength \[{\rm{400 nm}}\] ejects electrons with a maximum kinetic energy of \[{\rm{0}}{\rm{.860 eV}}\] from sodium metal. What is the binding energy of electrons to sodium metal?

UV radiation having a \(300\,{\rm{-nm}}\) wavelength falls on uranium metal, ejecting \(0.500\,{\rm{eV}}\) electrons. What is the binding energy of electrons to uranium metal?

Question: UV radiation having a 300nmwavelength falls on uranium metal, ejecting 0.500eVelectrons. What is the binding energy of electrons to uranium metal?

How can treating food with ionizing radiation help keep it from spoiling? UV is not very penetrating. What else could be used?

What is the wavelength of EM radiation that ejects \(2.00\,{\rm{eV}}\) electrons from calcium metal, given that the binding energy is \(2.71\,{\rm{eV}}\)? What type of EM radiation is this?

Question: What is the wavelength of EM radiation that ejects \(2.00\,{\rm{eV}}\) electrons from calcium metal, given that the binding energy is \(2.71\,{\rm{eV}}\)? What type of EM radiation is this?

Find the wavelength of photons that eject \(0.100\,{\rm{eV}}\) electrons from potassium, given that the binding energy is \(2.24\,{\rm{eV}}\). Are these photons visible?

Tanning salons use 鈥渟afe鈥� UV with a longer wavelength than some of the UV in sunlight. This 鈥渟afe鈥� UV has enough photon energy to trigger the tanning mechanism. Is it likely to be able to cause cell damage and induce cancer with prolonged exposure?

What is the maximum velocity of electrons ejected from a material by \(80\,{\rm{nm}}\) photons, if they are bound to the material by \(4.73\,{\rm{eV}}\)?