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Chemistry (600)
CHM135H1 (333)
Lecture

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Department
Chemistry
Course
CHM135H1
Professor
Kris Quinlan
Semester
Summer

Description
LECTURE 3 Chapters 5 Slide Number Notes 11 EX. - binding energy = 7.21 x 10^-19 J - E of photon > or = 7.21 x 10^-19 J - Longest wavelength = 6.63x10^-34 Js (3.00x10^8 ms) 7.21 x 10 ^-19 J = 2.76 x 10^-7 m = 276 nm - Will light with 290 nm eject electrons? NO - This is because increasing wavelength = decreasing frequency - 276nm is the longest wavelength that will eject electrons - below this threshold, no electrons ejected - increasing wavelength is decreasing energy - energy of photon = binding energy + kinetic energy of electron = 7.21x10^-19 J + 2.5 x 10^-19J = 9.7x10^-19J - v = Eh = 9.7x10^-19 J 6.676x10^-34Js = 1.5x10^15s - wavelength = cv = 3.00x10^8 ms 1.5 x 10^15s = =210nm 13 - monochromatic = one colour - energy needed to eject energy from Zn > than for Na therefore A wrong - same number of electrons ejected from both metals because same intensity of light shone for both therefore B and C wrong - zinc has a higher threshold frequency, therefore there is less kinetic energy therefore
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