Question

3. When metals are irradiated with light of a high enough frequency, electrons are ejected with kinetic energy given by the equation: KE = hv - where his Planck's constant, vis the frequency of the light, and is the binding energy of the electron in the metal atom. a) Which do you expect to have a higher binding energy, magnesium or sodium? Explain your answer in 1-2 sentences. b) Both sodium and magnesium emit electrons upon the absorption of violet light. However, only one of these two metals emits electrons upon the absorption of green light. Which metal emits electrons upon the absorption of green light? Explain your answer in 1-2 sentences. c) How would you expect your observations to change if ultraviolet light were used?

Answer 1

The question is regarding photoelectric effect. Binding energy of electron exist due to presence to protons in an atom

3 a) Mg would have higher binding energy because of high lonisation energy which is due to higher number of protons with respect to Na. - Nai Sodium b). VI B GYOR. - Mg: Magnesium Highest Least frequency frequency a decreasing frequency or increasing mavelingth of light on decreasing energy since, Na has lowe binding energy, It would amit é with green light also c) Ultraviolet light has higher energy thon Visible light. Hence, bath No a Mg will emit electrons.