Class Notes (1,000,000)
CA (600,000)
UTSG (50,000)
CHM (800)
CHM135H1 (400)

Notes taken during lecture

Course Code
Kris Quinlan

This preview shows half of the first page. to view the full 3 pages of the document.
LECTURE 3 – Chapters 5
Slide NumberNotes
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 m/s) / 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 = E/h = 9.7x10^-19 J / 6.676x10^-34Js = 1.5x10^15/s
-wavelength = c/v = 3.00x10^8 m/s / 1.5 x 10^15/s = =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 D is wrong
-Ans: E
14 -electron can only be at certain levels of the atom
-like stairs: a fixed number of positions
-unlike a ramp: an electron cannot be anywhere, cannot fall from
just any position
16 -de Broglie suggested that electrons may behave as waves
-important for small objects (ie. electrons) because of the inverse
relationship such that the smaller the mass, the longer the
17 -uncertainty significant for tiny masses
-electronic structure BEFORE 1900: light as waves, continuous,
spread out, mass-less; matter as discrete particles with mass and
-experiments (ie. blackbody radiation, photoelectric effect),
however, put forward the wave-particle duality (waves behaving
as particles and particles behaving as waves)
-instead of trying to pinpoint the exact location of electron, focus
instead on probability of finding the electron
18 - the many solutions refer to the different locations of the electron
19 - Schrodinger’s equation gives orbitals and energy
You're Reading a Preview

Unlock to view full version