13) Section 18.8 (2.5pts) The apparent change in position of a star. due to looking at it from different positions as earth moves is called doppler effect wavelength parallax apparent brightness 14) Section 18.3 (2.5pts) If a given spectral line is split into multiple lines due to magnetic fields we call this Absorption Spectrum Aurora Photosphere Zeeman Effect 15) As compared with a large telescope mirror, a large telescope lens (2.5pts) is easier to support against sag. does not disperse light. can provide higher magnification. has no advantages. 16) A large modern astronomical telescope (2.5pts) O is designed for high magnifications. uses a single lens. uses a single mirror. uses a number of smaller mirrors. 17) Section 18.11 (2.5pts) What two factors are needed to determine the size of the star? O temperature and apparent brightness temperature and luminosity intrinsic and apparent brightness 0 temperature and color 18) The sun has (2.5pts) no atmosphere. an atmosphere just above its surface only. an atmosphere that extends only as far as the earth. an atmosphere that extends well out into the solar system