Astrophysics revision

As the temperature of a star increases, the intensity of light from it

• may increase or decrease depending of the type of star

• increases

• decreases

• remains the same

The Sun is a yellow star, indicating that it is

• a hot star

• a cold star

• neither hot nor cool

• either hot or cool

The phenomenon of splitting of white light into seven colours is know as

• reflection

• refraction

• dispersion

• diffraction

The absorption and emission lines present in a star’s spectrum determine the characteristics of

• the elements in a star

• the intensity of a star

• the frequency of a star

• all of the above

Our Sun is a main sequence star. In a main sequence star

• hydrogen atoms fuse to form helium atoms in the core

• helium atoms fuse to Carbon atoms in the core

• elements fuse to form elements up to iron in the core

• no fusion reactions occur

Stars above the main sequence in an H–R diagram

• have used up all of the helium atoms in their cores and have expanded in size to form supergiants.

• have used up all of the hydrogen atoms in their cores and have expanded in size to form supergiants.

• have used up all of the helium atoms in their cores and have expanded in size to form red giants.

• have used up all of the hydrogen atoms in their cores and have expanded in size to form red giants.

What is the only direct method we have of measuring distances to stars?

• Red shift method

• Standard Candles

• Parallax

• Spectroscopy

The more massive the star, the more luminous. This relationship is true for which of the following?

• All Stars

• White Dwarf Stars

• Red Giants

• Main Sequence Stars

Astronomical Units are a measurement of what distance?

• The time taken for light to reach Earth from the Sun

• The radius of the Earths orbit around the Sun

• The circumference of the Earths orbit around the Sun

• The diameter of the Earths orbit around the Sun

When an average sized star's life ends it becomes:

• Supernova

• Nova

• Planetary Nebula

• Blue dwarf