Three statements about electrons are:
I. Electrons interact through virtual photons.
II. Electrons interact through gluons.
III. Electrons interact through particles W and Z.
Which statements identify the particles mediating the forces experienced by electrons?
To which of the following classes of particles does a meson belong?
A proton is confined within a nucleus. What is the order of magnitude of the uncertainty in its momentum?
A pure sample of iodine-131 decays into xenon with a half-life of 8 days.
What is after 24 days?
When the nucleus is bombarded with alpha particles the following nuclear reaction can occur.
The particle X is a
An optically active substance
A graph of the variation of average binding energy per nucleon with nucleon number has a maximum. What is indicated by the region around the maximum?
In 2017, two neutron stars were observed to merge, forming a black hole. The material released included chemical elements produced by the r process of neutron capture.
Describe two characteristics of the elements produced by the r process.
Which of the following expresses the ratio as a difference in orders of magnitude?
Some transitions between the energy states of a particular atom are shown.
Energy transition gives rise to a photon of green light. Which transition will give rise to a photon of longer wavelength?