Electroweak interaction/Quiz

Electroweak interaction is a lecture about the application of laboratory and theoretical physics to astronomical phenomena.

The ALMA correlator is one of the most powerful supercomputers in the world. Credit: ALMA (ESO/NAOJ/NRAO), S. Argandoña.

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1 Which of the following are characteristic of a β+ decay?

a mu neutrino
a positron emission
a decay product of a neutron
weak interaction
an electron neutrino
comes in mutable varieties

2 True or False, A calculation of energy is not possible unless a mass is involved.


3 Which of the following is not an electron volt?

the angular momentum of the planet Mercury around the Sun
a unit of energy
a quantity that denotes the ability to do work
1.2 PeV
a unit dimensioned in mass, distance, and time
a unit not based on the Coulomb

4 Complete the text:

Match up the item letter with each of the first astronomical source possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Gamma rays - G
Superluminals - H
cosmic rays

galactic nuclei


electron-positron annihilation

weak force nuclear decay


511 keV photon pair production

solar wind


5 Complete the text:


tracks in emulsion chambers have been used for

measurements of

nuclei above

in a series of balloon-borne experiments.

6 True or False, A unit vector is a direction with a magnitude of one.


7 Which of the following are involved in the weak force?

a core which emits neutrinos
Fermi's β-decay theory
undetectable with balloon-borne detectors
Gamow-Teller interactions
steady enough emission to be used as a standard for X-ray emission
observed with delta-rays in 1731
M. Fierz

8 The strong force is involved in which of the following phenomena?

the sum of the spins
Pauli's exclusion principle
radio waves

9 True or False, When the magnetic poles of the Sun reverse during the solar cycle, there is a short time in which the polar diameter is greater than the equatorial diameter.


10 Which of the following are associated with electromagnetics?

angular momentum transfer
solar wind
the baryon neutrino
charge neutralization

11 True or False, The generalized weak force theory combines the Fermi and Gamow-Teller conditions into a unified theory.


12 Which of the following are associated with the big bang neutrinos?

a launch location
relic neutrinos
of order of the photon density
the thermal energy at which neutrinos decouple
neutrinos dynamically dominate baryons
a contracting universe

13 True or False, The force of gravity is the first astronomical source of the strong nuclear force.


14 The generalization to self-gravitating continua is outlined focused on the classification problem of singularities and metamorphoses arising in the


15 If energy is the impetus behind all motion and activity, which of the following are associated with power?

a launch location
a rate of change of the impetus with time
photon density
an acceleration of the impetus
neutrinos dynamically dominating baryons
a rate of change of mass


For standard basis, or unit, vectors (i, j, k) and vector components of a (ax, ay, az), what are the right ascension, declination, and value of a?

if the x-axis is the longitude of the Greenwich meridian, and ax equals ay, then RA equals 6h
if the x-axis is the longitude of the Greenwich meridian, and ax equals ay, then RA equals 3h
the value of a is given by  
if ax equals ay equals az, then the declination is -45°
if ax equals ay equals az, then the declination is +45°

17 Which of the following are associated with the envelope of the polarization current density?

emission of electromagnetic radiation from a superluminal charged particle
intensity of some components decays as the inverse of the distance from the source
non-spherically-decaying sources
emission contains very high frequencies not present in the synthesis of the source
non-spherically decaying components of the radiation do not violate energy conservation
strong electromagnetic fields are compensated by weak fields elsewhere


  1. The electroweak interaction like the other interactions is a manifestation of a general electromagnetic type interaction.

See also


{{Charge ontology}}

{{Radiation astronomy resources}}