Blue light differs from red light in that
a. blue light has a higher energy than red light.
b. blue light has a lower energy than red light.
c. blue light has a shorter wavelength than red light.
d. blue light has a longer wavelength than red light.
e. More than one of the other choices are correct.
Question 2The total mass of a binary system can be calculated from
a. the ratio of the angular separation from the center of mass of each of the stars.
b. the distance to the binary and its radial velocity.
c. the semimajor axis and period of the orbit.
d. the radial velocities of the two stars.
e. the time required for the smaller star to eclipse the larger star.
Question 3The primary mirrors of most radio telescopes is similar to the primary mirror of a reflecting optical telescope in that
a. they are both concave in shape.
b. they are both convex in shape.
c. they are typically the same size.
d. they are both made of metal.
e. they have nothing in common.
Question 4The star Algol is
a. an astrometric binary.
b. a spectroscopic binary.
c. a visual binary.
d. an eclipsing binary.
e. a spectroscopic binary and an eclipsing binary.
Question 5Which of the following features of a telescope determines its light-gathering power?
a. the focal length of the primary lens
b. the focal length of the eyepiece
c. the diameter of the primary lens
d. length of the telescope tube
e. None of the other choices are correct.
Question 6Stars on the main sequence with the greatest mass
a. are spectral type M stars.
b. are spectral type O stars.
c. are located at the bottom of the main sequence in the H-R diagram.
d. have masses very similar to the Sun.
e. are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.
Question 7What is the frequency of the shortest wavelength light that can be detected by the average human eye?
a. 0.0025 Hz
b. 7.5 1014 Hz
c. 3.0 108 m/s
d. 700 nm
e. 400 nm
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