Test 1 Flashcards
Which of the following has the lowest energy?
a. infrared
b. ultraviolet
c. visible light
d. x-rays
a. infrared
Which of the following has the shortest wavelength?
a. green
b. yellow
c. blue
d. red
c. blue
What type of spectrum is given off when light passes through a cloud of gas?
a. continuous
b. emission
c. absorption
d. it depends on the consumption
c. absorption
Which of the following statements is true?
a. the universe is opaque but used to be transparent
b. the universe is transparent but used to be opaque
c. the universe has always been opaque
d. the universe has always been transparent
b. the universe is transparent but used to be opaque
Which of the following is Balmer transition?
a. 1 -> 2
b. 2 -> 2
c. 3 -> 2
d. both (a) and (c)
c. 3 -> 2
How many types of redshift were discussed in class?
a. 1
b. 2
c. 3
d. 4
b. 2
Which of the following is a late stage quasar?
a. QSA
b. QSO
c. QSR
d. QSZ
b. QSO
What type of particle is released during a Lyman transition?
a. Proton
b. Electron
c. Neutron
d. None of the above
d. None of the above
Roughly how far away is the nearest quasar?
a. One billion light years
b. Two billion light years
c. Five billion light years
d. Ten billion light years
b. Two billion light years
Which of the following contributes most directly to the formation of a star’s plasma core?
a. Density
b. Temperature
c. Pressure
d. They all contribute equally
b. Temperature
What is the initial shape of the debris filed around a star?
a. spherical
b. elliptical
c. disk-shaped
d. it depends upon the mass of the star
a. spherical
What is the first element to fuse in a star?
a. Hydrogen
b. Helium
c. Carbon
d. It depends on the composition
a. Hydrogen
How many steps are there in the proton-proton chain?
a. 1
b. 2
c. 3
d. 4
c. 3
Explain how a prism takes white light and converts it into a continuous spectrum.
- protons enter prism
- wave is slowed down
- protons are redirected based on the energy of the proton
- shortest wavelength is red
- longest wavelength is violet
- visible light combined is white
Discuss how both emission and absorption spectra can be used to determine composition. What assumption must be made to do this?
- Light passing through cold gas produces absorption spectrum
- Light emitting from charged particles interacts with a hot gas, it produces an emission spectrum
Assuming all matter acts the same throughout the universe - resulting spectra produces an identifiable pattern (or ‘fingerprint’) based on the molecular structure of the gas
- we can identify the composition of the cloud
