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 above.
Question 2Synchrotron radiation is produced by
a. objects with temperature below 10,000 K.
b. high-velocity electrons moving through a magnetic field.
c. cold hydrogen atoms in space.
d. the collapsing cores of massive stars.
e. helium flash.
Question 3The objective of most radio telescopes is similar to the objective 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 theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula.
b. laboratory measurements of the mass of the neutrino.
c. the brightening of supernovae a few days after they are first visible
d. underground counts from solar neutrinos.
e. the detection of neutrinos from the supernova of 1987.
Question 5Which of the following features of a telescope determines its light gathering power?
a. The focal length of the objective
b. The focal length of the eyepiece
c. The diameter of the objective
d. Length of the telescope tube
e. None of the above.
Question 6Massive stars cannot generate energy through iron fusion because
a. iron fusion requires very high density.
b. stars contain very little iron.
c. no star can get hot enough for iron fusion.
d. both fusion or fission of iron nuclei absorb energy
e. massive stars supernova before they create an iron core.
Quick Reply
