Quantum and Atomic Physics – Flashcards
Unlock all answers in this set
Unlock answersquestion
The Cathode Ray Tube experiment is associated with
answer
J.J. Thomson
question
The electron charge was measured the first time in
answer
Oil drop experiment
question
What is the difference between cathode rays and X-rays
answer
Cathode rays are particles and x-rays are electromagnetic radiation
question
What distinctive phenomena are illustrated in X-ray spectra
answer
Bremsstrahlung, internal atomic structure of the anode
question
Which of the following colors indicates an object of the lowest temperature
answer
Red
question
Which is a property of a black body radiator
answer
It absorbs all incident radiation, then re-emits it at frequencies determined by its temperature
question
Which of the following photons has the greatest energy
answer
γ-photon
question
What discrepancy between experiment and theory helped lead Max Planck to his quantum theory
answer
The Ultraviolet catastrophe
question
The energy of a photon depends on
answer
temperature
question
How does the energy of a photon change if the wavelength is doubled
answer
Energy is halved
question
How dos the momentum of a photon change if the wavelength is halved
answer
doubles
question
The photoelectric effect explains
answer
The particle nature of light
question
The kinetic energy of photo-electrons depends on
answer
work function, wavelength of light
question
which of the following is the formula of the photon momentum
answer
p=hf/c
question
the stopping potential of photo-electrons depends on which of the following
answer
the frequency of the photons, the composition of the metal surface
question
which of the following formulas expresses the photoelectric effect
answer
hf=W₀+KE
question
all of the following are properties of γ-rays except
answer
they ionize gases
question
which of the following phenomena provides the best evidence that light can have particle properties
answer
compton scattering
question
which of the following phenomena provides the best evidence that particles can have wave properties
answer
the interference pattern produced by neutrons incident on a crystal
question
which of the following formulas can be used to determine de broglie wavelength
answer
λ=h/mv
question
a photon can disappear producing an electron and positron. what is the phenomenon called
answer
pair production
question
when a proton collides with an antiproton they disappear producing photons. this phenomenon is called
answer
annihilation
question
electrons are accelerated to a maximum speed of v in an x-ray tube by an applied voltage V₀. what is the maximum speed of the electrons if the voltage is quadrupled.
answer
2v
question
in compton effect experiment a photon scattered from an electron at rest increases its wavelength. which of the following deflection angles provides the greatest increase in the wavelength of the scattered photon
answer
180
question
if all of the following objects move at the same speed which one will have the greatest debroglie wavelength
answer
electron
question
rutherfords scattering α-particles by a gold foil experiment disproved which of the following
answer
plum-pudding model of the atom
question
in rutherfords experiment most of α-particls pass through the foil without deflection. which of the following properties of the atom can be explained by this observation
answer
an atoms positive charge is concentrated in the nucleus, an atom is mostly empty space
question
which of the following statements can be associated with boars theory of the atom
answer
an electron can change its energy only by a certain portion when it jumps between the orbits, the angular momentum of an electron around the nucleus is equal an integer time h/2pi
question
when an electron falls from an orbit the first excited state to the ground state
answer
a photon is emitted
question
in the bohr model when an electron jumps from the n=1 orbit to the n=3 orbit what is its new orbital radius as a proportion of r1
answer
9r1
question
in the bohr model when an electron jumps from the n=1 orbit to the n=4 orbit what is its new energy as a proportion of E1
answer
E1/16
question
in the bohr model, when an electron orbits a single proton in the n=5 state, how many debroglie wavelengths fit onto the circumference of this orbit
answer
5
question
an electron accelerated from rest by a 600V potential difference has a debrolgie wavelength of λ. what would the electrons de broglie wavelength be if the potential difference had been 150 V
answer
4λ
question
according to maxwells theory of electromagnetism, an electron orbiting a nucleus must
answer
radiate its energy
question
according to the bohrs theory of the hydrogen atom, electrons starting in the 4th energy level and eventually ending in the ground state could produce a total of how many different spectral lines
answer
6
