Astrophysics/Quiz - Wikiversity

Astrophysics is a lecture and an article about the application of laboratory physics to astronomical phenomena. It is part of the astronomy course on the principles of radiation astronomy.

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1 Quiz
2 Hypotheses
3 See also
4 External links

Quiz

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

	TRUE
	FALSE

2 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

3 Yes or No, The force of gravity is a major portion of the strong nuclear force.

	Yes
	No

4 Complete the text:

The

tracks in emulsion chambers have been used for

measurements of

nuclei above

in a series of balloon-borne experiments.

5 True or False, The average value of the radius of the Earth's orbit around the Sun is a displacement.

	TRUE
	FALSE

6 The science of physical and logical laws is called

7 True or False, The temperature of the cores of stars may be determined by the balance between the gravitational attraction and the gas pressure.

	TRUE
	FALSE

8 The use of the principle of line of sight allows what phenomenon to be determined?

	the Moon is closer to the Earth than the Sun
	the planet Mercury is nearer to the Earth than Venus
	any cumulus cloud overhead follows the Sun across the sky
	the plane of the Earth's orbit around the Sun is in the plane of the galaxy
	the surface of the photosphere of the Sun is hotter than the surface of Mars
	lightning always precedes rain

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

	TRUE
	FALSE

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

	a core which emits neutrinos
	Fermi's β-decay theory
	²⁶Al
	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

11 True or False, Any space in the real universe is completely empty of microwaves.

	TRUE
	FALSE

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

	s-waves
	the sum of the spins
	neutrinos
	Pauli's exclusion principle
	deuterium
	radio waves

13 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.

	TRUE
	FALSE

14 Which of the following are associated with electromagnetics?

	angular momentum transfer
	solar wind
	protons
	electrons
	the baryon neutrino
	charge neutralization

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

	TRUE
	FALSE

16 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

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

	TRUE
	FALSE

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

19 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

20 A first astronomical source has?

	a temporal distribution with at least one datum
	a spectral distribution
	a spatial distribution
	a position or location
	a geognosy
	scientific or observational investigations

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

	if the x-axis is the longitude of the Greenwich meridian, and a_x equals a_y, then RA equals 6^h
	if the x-axis is the longitude of the Greenwich meridian, and a_x equals a_y, then RA equals 3^h
	the value of a is given by $a={\sqrt {a_{x}^{2}+a_{y}^{2}+a_{z}^{2}}}$
	if a_x equals a_y equals a_z, then the declination is -45°
	if a_x equals a_y equals a_z, then the declination is +45°