I. The spectrum of alpha particle energies
II. The spectrum of beta particle energies
III. The spectrum of gamma ray energies
I and II only
I and III only
II and III only
I, II and III
greater than E
less than E
Which change in E and which change in Z is most likely to result in greater deviations from the Rutherford scattering model?
Which of the following is approximately the ratio
λ ∝ E
λ ∝ E−1
What is when t = 200 s?
What is the maximum kinetic energy of the photoelectrons that reach the anode?
is constant because the photons have a constant energy.
is constant because the metal has a constant work function.
varies because the electrons are not equally bound to the metal lattice.
varies because the work function of the metal is different for different electrons.
Continuous energy spectrum in β– decay
Electron diffraction from crystals
Existence of atomic energy levels
Existence of nuclear energy levels
I. Discrete energy of alpha particles
II. Continuous energy of beta particles
III. Discrete energy of gamma rays
Which of the observations provide evidence of the existence of nuclear energy levels?
I and III only
Which changes to the width of the barrier and to the height of the barrier will always make the tunnelling probability greater?
The magnitude of the wave function
The magnitude of the (wave function)2
I. alpha particles
II. beta particles
III. gamma ray photons.
Which of the above statements is/are true?
Scattering of alpha particles
Vs varies with frequency f.
Planck’s constant may be determined from the charge of an electron e multiplied by
the area under the graph.
de Broglie hypothesis.
Heisenberg uncertainty principle.
(amplitude of the wavefunction)2.
rms value of the wavefunction.
The impact parameter of the collision
The existence of a force different from electrostatic repulsion
The size of alpha particles
The electric field inside the nucleus
Which of the following is the de Broglie wavelength of the electron after acceleration?
Which of the following diagrams could represent the visible light emission spectrum of hydrogen?
is constant because the volume of a nucleus is proportional to its nucleon number.
is constant because the volume of a nucleus is proportional to its proton number.
depends on the nucleon number of the nucleus.
depends on the proton number of the nucleus.
λ (expressed in s–1). The number of nuclei of this element at t = 0 is N. What is the expected number of nuclei that will have decayed after 1 s?
scattering charged particles off the nuclei.
injecting the nuclei in a mass spectrometer.
measuring the de Broglie wavelength of the nuclei.
observing the spectrum of the nuclei.
The orbital path of the electron fits a standing wave.
The position of the electron is undefined but its momentum is well defined.
The momentum of the electron is undefined but its position is well defined.
The electron is described by wavefunctions.
I. The number of electrons released is unchanged
II. The current falls to zero
III. The kinetic energy of the electron increases
I. The kinetic energy of the emitted electrons increases with increasing light frequency.
II. The electrons are emitted without time delay.
Which of these observations, if any, can be explained in terms of the wave theory of light?
Neither I nor II
I and II
I. number of electrons emitted per unit time depends on the intensity of the incident light
II. energy of the electrons depends on the frequency of the incident light
III. emission of the electrons takes place instantaneously.
Which of the above statements can only be explained by assuming light consists of photons?
II and III only
I. Increase the intensity of the incident light
II. Increase the frequency of light
III. Decrease the work function of the surface
Which changes will result in electrons of greater energy being emitted from the surface?
nucleus is approximately three times that of the diameter of a nucleus of
uncertainty in position of the electron.
momentum of the electron.
probability of finding an electron at a particular point.
uncertainty in the velocity.
both the momentum and position of the particle are known precisely.
the position of the particle is known precisely but all knowledge of its momentum is lost.
both the energy and the position of the particle are known precisely.
only the momentum of the particle is known precisely but all knowledge of its position is lost.
me are emitted, provided the frequency of the radiation is greater than f0. What is the maximum speed of the electron when radiation of frequency f falls on the photocell?
I. Einstein photoelectric effect
II. de Broglie hypothesis
III. Rutherford alpha particle scattering.
Which of the phenomena can be verified by firing electrons at a metal surface?
Electron emission is instantaneous.
Electrons are only emitted if the incident light is above a certain minimum wavelength.
The energy of the emitted electrons depends on the light intensity.
The energy of the emitted electrons does not depend on the frequency of the incident light.