Week 1-3 assignment question and
answers [Failures of classical
mechanicals and introduction to
quantum mechanics]
What happens when you turn off the lights? ✔✔Photons absorbed by the surroundings
Amplitude ✔✔Height of a wave
Wavelength ✔✔Horizontal distance between the crests or between the troughs of two
adjacent waves
SI unit of wavelength ✔✔meter (m)
Frequency ✔✔number of complete oscillations per unit time
SI unit of frequency ✔✔Hertz (Hz) or per second (s^-1)
Define a black body ✔✔an object that absorbs and emits radiation
A perfect black body ✔✔a perfect absorber and emitter of radiation [with 100% efficiency]
Ultraviolet catastrophe ✔✔According to the Rayleigh-Jeans equation in classical physics,
objects emit an extreme amount of radiation (values approach infinity) in the UV region at low
wavelengths, which disagrees with the experimental results and was corrected by Planck's
theory of quantization of energy.
, Entrophy ✔✔Measure of chaos in a system
Planck's constant ✔✔6.626 x 10^-34 Js
Photoelectric effect ✔✔Ejection of an electron from a metal surface using a photon whose
energy is greater than the electron's binding energy
Energy of a photon is given by: ✔✔E=hv
Excitation ✔✔Movement of an electron from a lower to a higher energy level after absorbing
energy from a photon
Relaxation ✔✔Movement of an electron from a higher to a lower energy level releasing energy
in form of a photon
define an orbital ✔✔a region around a nucleus where electron(s) is likely to be found
An electron absorbs energy from a _________ and transitions from a lower energy level to a
higher energy level ✔✔photon
Rutherford's explaned an atom to have:
1. nucleus with a potive charge
2. electron(s) outside the nucleus.
He failed to explain how the electrons were arranged around the nucleus and why they never
fell into the nucleus following electrostatic attarction between the positively charged nucleus
and the negatively charged electrons. In 1913, Niel's Bohr proposed a new model for Hydrogen
answers [Failures of classical
mechanicals and introduction to
quantum mechanics]
What happens when you turn off the lights? ✔✔Photons absorbed by the surroundings
Amplitude ✔✔Height of a wave
Wavelength ✔✔Horizontal distance between the crests or between the troughs of two
adjacent waves
SI unit of wavelength ✔✔meter (m)
Frequency ✔✔number of complete oscillations per unit time
SI unit of frequency ✔✔Hertz (Hz) or per second (s^-1)
Define a black body ✔✔an object that absorbs and emits radiation
A perfect black body ✔✔a perfect absorber and emitter of radiation [with 100% efficiency]
Ultraviolet catastrophe ✔✔According to the Rayleigh-Jeans equation in classical physics,
objects emit an extreme amount of radiation (values approach infinity) in the UV region at low
wavelengths, which disagrees with the experimental results and was corrected by Planck's
theory of quantization of energy.
, Entrophy ✔✔Measure of chaos in a system
Planck's constant ✔✔6.626 x 10^-34 Js
Photoelectric effect ✔✔Ejection of an electron from a metal surface using a photon whose
energy is greater than the electron's binding energy
Energy of a photon is given by: ✔✔E=hv
Excitation ✔✔Movement of an electron from a lower to a higher energy level after absorbing
energy from a photon
Relaxation ✔✔Movement of an electron from a higher to a lower energy level releasing energy
in form of a photon
define an orbital ✔✔a region around a nucleus where electron(s) is likely to be found
An electron absorbs energy from a _________ and transitions from a lower energy level to a
higher energy level ✔✔photon
Rutherford's explaned an atom to have:
1. nucleus with a potive charge
2. electron(s) outside the nucleus.
He failed to explain how the electrons were arranged around the nucleus and why they never
fell into the nucleus following electrostatic attarction between the positively charged nucleus
and the negatively charged electrons. In 1913, Niel's Bohr proposed a new model for Hydrogen
