ASTRO 1 FINAL EXAM PSU TEST
QUESTIONS WITH FULL ANSWERS
⩥ What is the reason for the seasons on earth Answer: earth is tilted with
respect to the sun by about 23.5 degrees
⩥ As compared to a cool star a hotter star emits Answer: shorter
wavelength, higher frequency, bluer color
⩥ at approximately what time does the third quarter moon rise Answer:
midnight
⩥ the electrons in a cloud of hydrogen gas are making the transition
from excited states to the ground state. What does the spectrum of this
cloud of gas look like? Answer: it will consist of a few bright emission
lines at a very specific wavelengths
⩥ If earth had its orbit changed so that at all the point along its orbit it
was always the same distance from the sun (circular) how would this
effect the seasons on earth? Answer: the same as they are now
⩥ I detect a star giving off more ultraviolet light than green light. What
property of the star can I estimate with this info Answer: its temperature
,⩥ What do you expect the spectrum of an object that is 1,000,000 kelvin
to be like Answer: it should peak at x ray wavelengths
⩥ what time of year is it dark all day (and night) at the South pole
Answer: june
⩥ A planet with its rotation axis tilted by 40 degrees relative to its orbital
plane around its star would Answer: have dark all the time on the south
pole during its winter
⩥ The planets are seen in the Zodiac constellations because Answer: the
orbit the sun in the same plane as the earth does
⩥ What makes a transition from higher energy state to lower energy
state when a photon is emitted by an atom? Answer: electron
⩥ 13. Which of the following is FALSE?
a) Light, radio, ultraviolet, and gamma rays are all forms of
electromagnetic radiation.
b) Emission spectra are characterized by narrow, bright lines of different
colors.
c) An absorption spectrum appears as a continuous spectrum interrupted
by a series of
, dark lines.
d) The energy of a photon is inversely proportional to the wavelength of
the radiation.
e) The wavelengths of the emission lines produced by an element are
different from the
wavelengths of an absorption line produced by the same element.
Answer: The wavelengths of the emission lines produced by an element
are different from the wavelengths of an absorption line produced by the
same element
⩥ One of the lines of hydrogen has a wavelength of 121.6nm. If a cloud
of hydrogen gas is moving towards us at 200 km/s, what will we detect?
Answer: An emission line in the cloud's spectrum with a wavelength
shorter than 121.6 nm
⩥ Why does light come in different colors Answer: differences in
wavelength
⩥ Say you are in the bottom of Happy Valley. How does the force of
gravity compare to what it would be on top of Mount Nittany? Answer:
slightly greater in happy valley than on mount nittany
⩥ what kind of telescope would have to be put in space to be effective
Answer: xray
QUESTIONS WITH FULL ANSWERS
⩥ What is the reason for the seasons on earth Answer: earth is tilted with
respect to the sun by about 23.5 degrees
⩥ As compared to a cool star a hotter star emits Answer: shorter
wavelength, higher frequency, bluer color
⩥ at approximately what time does the third quarter moon rise Answer:
midnight
⩥ the electrons in a cloud of hydrogen gas are making the transition
from excited states to the ground state. What does the spectrum of this
cloud of gas look like? Answer: it will consist of a few bright emission
lines at a very specific wavelengths
⩥ If earth had its orbit changed so that at all the point along its orbit it
was always the same distance from the sun (circular) how would this
effect the seasons on earth? Answer: the same as they are now
⩥ I detect a star giving off more ultraviolet light than green light. What
property of the star can I estimate with this info Answer: its temperature
,⩥ What do you expect the spectrum of an object that is 1,000,000 kelvin
to be like Answer: it should peak at x ray wavelengths
⩥ what time of year is it dark all day (and night) at the South pole
Answer: june
⩥ A planet with its rotation axis tilted by 40 degrees relative to its orbital
plane around its star would Answer: have dark all the time on the south
pole during its winter
⩥ The planets are seen in the Zodiac constellations because Answer: the
orbit the sun in the same plane as the earth does
⩥ What makes a transition from higher energy state to lower energy
state when a photon is emitted by an atom? Answer: electron
⩥ 13. Which of the following is FALSE?
a) Light, radio, ultraviolet, and gamma rays are all forms of
electromagnetic radiation.
b) Emission spectra are characterized by narrow, bright lines of different
colors.
c) An absorption spectrum appears as a continuous spectrum interrupted
by a series of
, dark lines.
d) The energy of a photon is inversely proportional to the wavelength of
the radiation.
e) The wavelengths of the emission lines produced by an element are
different from the
wavelengths of an absorption line produced by the same element.
Answer: The wavelengths of the emission lines produced by an element
are different from the wavelengths of an absorption line produced by the
same element
⩥ One of the lines of hydrogen has a wavelength of 121.6nm. If a cloud
of hydrogen gas is moving towards us at 200 km/s, what will we detect?
Answer: An emission line in the cloud's spectrum with a wavelength
shorter than 121.6 nm
⩥ Why does light come in different colors Answer: differences in
wavelength
⩥ Say you are in the bottom of Happy Valley. How does the force of
gravity compare to what it would be on top of Mount Nittany? Answer:
slightly greater in happy valley than on mount nittany
⩥ what kind of telescope would have to be put in space to be effective
Answer: xray
