CAPA CH 13 EXAM QUESTIONS AND ANSWERS ALL CORRECT
Why is it so difficult to take pictures of extrasolar planets?
A) Their light is overwhelmed by the light from their host star.
B) Extrasolar planets give off light at different wavelengths than planets in our solar system.
C) No telescope ...
Why is it so difficult to take pictures of extrasolar planets?
A) Their light is overwhelmed by the light from their host star.
B) Extrasolar planets give off light at different wavelengths than planets in our solar
system.
C) No telescope is powerful enough to detect the faint light from a distant planet.
D) Because they can essentially never be spatially resolved on the images.
E) There is too much competition in science that telescopes are too busy with other
projects - Answer- A) Their light is overwhelmed by the light from their host star.
Suppose you are using the Doppler technique to look for planets around another star.
What must you do?
A) Carefully examine a single spectrum of the star.
B) Compare many spectra of an orbiting planet taken over a period of many months or
years.
C) Carefully examine a single spectrum of an orbiting planet.
D) Compare the brightness of the star over a period of many months or years.
E) Compare many spectra of the star taken over a period of many months or years. -
Answer- E) Compare many spectra of the star taken over a period of many months or
years.
In general, which type of planet would you expect to cause the largest Doppler shift in
the spectrum of its star?
A) a low-mass planet that is far from its star
B) a massive planet that is close to its star
C) a planet that emits in the infrared
D) a low-mass planet that is close to its star
E) a massive planet that is far from its star - Answer- B) a massive planet that is close to
its star
Suppose a planet is discovered by the Doppler technique and is then discovered to
have transits. In that case, we can determine all the following about the planet except
_______.
A) its precise mass
, B) its physical size (radius)
C) its rotation period
D) its density
E) its orbital period - Answer- C) its rotation period
You observe a star very similar to our own Sun in size and mass. This star moves very
slightly back and forth in the sky once every 4 months, and you attribute this motion to
the effect of an orbiting planet. What can you conclude about the orbiting planet?
A) The planet must have a mass about the same as the mass of Jupiter.
B) The planet must be farther from the star than Neptune is from the Sun.
C) The planet must be closer to the star than Earth is to the Sun.
D) You do not have enough information to say anything at all about the planet.
E) The planet must be very small - Answer- C) The planet must be closer to the star
than Earth is to the Sun.
Which of the following will allow you to learn something about a transiting planet's
atmospheric composition?
A) Compare spectra obtained before and during an eclipse.
B) Use the Doppler method to study the planet throughout a cycle from one transit to
the next.
C) Looking at the spectral features from the light curve to decipher its chemical 'finger
prints'.
D) Look for slight variations in the time between transits.
E) Calculate the planet's size, and then use size to infer what its atmospheric
composition must be. - Answer- A) Compare spectra obtained before and during an
eclipse.
Very few of the known extrasolar planets have sizes as small as Earth. The most likely
reason for this fact is that _______.
A) small planets are usually made of materials that cannot be detected
B) small planets are more difficult to detect than larger planets
C) small planets orbit too far from their stars and therefore reflect little light
D) small planets are not hot enough
E) small planets are extremely rare - Answer- B) small planets are more difficult to
detect than larger planets
What is an extrasolar planet?
A) a planet that is extra large compared to what we'd expect
B) a planet that is not one of the 8 main ones
C) a planet that orbits a star that is not our own Sun
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