If you compare two stars,
a. the one with the larger radius will always have the greater luminosity.
b. the one with the higher surface temperature will always have the greater luminosity.
c. the one with the smaller absolute magnitude will always have the greater luminosity.
d. the one with the larger surface area has the greater energy flux from its surface.
Question 2Which has the larger light-gathering power?
a. a telescope of 5 cm diameter and focal length of 50 cm
b. a telescope of 6 cm diameter and focal length of 100 cm
c. a telescope of 2 cm diameter and focal length of 100 cm
d. a telescope of 3 cm diameter and focal length of 75 cm
e. both b and c since they have the same focal length.
Question 3The most accurate way to determine the surface temperature of a star is to study
a. the pattern of absorption lines from various atoms.
b. the relative intensities of light measured through different photometric filters.
c. the peak wavelength of the star's continuous blackbody spectrum.
d. pattern of emission lines that are on the star's spectrum.
Question 4In a reflecting telescope the primary is a _______.
a. prism
b. mirror
c. lens
d. diffraction grating
e. photographic plate
Question 5How can we tell that some stars are relatively close to us in the sky?
a. Some stars are occasionally eclipsed by the Moon, so they must be nearby.
b. Some stars vary in brightness caused by sunspots we can see because they are so close.
c. Some stars appear to be extremely bright and must therefore be very close to us.
d. Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.