The centers of granules
a. are hot material rising to the photosphere from below.
b. are cool material falling from the photosphere to the regions below.
c. are fainter and hotter than their surroundings.
d. are brighter and cooler than their surroundings.
e. show strong Zeeman effects.
Question 2Which of the following statements best describes Kepler's 3rd law of planetary motion?
a. The smaller the diameter of a planet, the faster its rotational period is.
b. The orbital period of a planet is directly proportional to the diameter of the planet.
c. The smaller the orbit, the longer its orbital period is.
d. The larger the orbit, the longer its orbital period is.
Question 3Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere.
b. shock waves move through the photosphere.
c. the Sun rotates differentially.
d. they are cooler regions than the photosphere.
e. they radiate their energy into space faster than the rest of the photosphere.
Question 4The eccentricity of a planet's orbit describes
a. westward motion in the night sky when observed on successive nights.
b. the deviation in shape when compared to a circle.
c. its tilt with respect to the ecliptic plane.
d. the tilt of the planet's rotational axis with respect to the ecliptic.
Question 5The Sun's magnetic field is evident in the looped shapes of
a. solar flares.
b. sunspots.
c. the corona.
d. granules.
e. prominences.
Question 6A comet in a highly elliptical orbit is found to have a semimajor axis equal to one astronomical unit (AU). According to Kepler's 3rd law, what would be the sidereal period of this comet?
a. more than one year
b. one year
c. less than one year
d. 76 years; the same for every comet
e. Not enough information is given to determine this.
Quick Reply
