(Solution) - 1 When light of wavelength 1 is incident on a -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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1. When light of wavelength ?1 is incident on a certain photoelectric cathode, no electrons are emitted no matter how intense the incident light is. Yet when light of wavelength ?2 < ?1 is incident, electrons are emitted even when the incident light has low intensity. Explain.
2. The distance between Li+ and Cl- ions in a LiCl crystal is 0.257 nm. Find the energy of electrons that have a wavelength equal to this spacing.