1. Isotopes of a particular element in the periodic table have which nuclear property in common?
A the same number ofneutrons but different numbers of protons in the nucleus.
B the same number ofprotons but different numbers of neutrons in the nucleus.
C the same total number ofprotons and neutrons in the nucleus.
D the same number ofneutrons, but different numbers of protons and electrons in thenucleus.

2. The temperature of the Sun's photosphere is
A 5800 K.
B about 10,000 K.
C 4300 K
D close to 1 millionK.

3. Granulation on the surface of the Sun is caused by
A magnetic fielddisturbances above the solar surface.
B convective currentscarrying heat from beneath the surface.
C nuclear fusion processesoccurring just below the surface.
D differential rotation ofthe Sun.

4. The neutral hydrogen atom consists of
A one proton and oneneutron.
B one proton.
C one proton, one neutron,and one electron.
D one proton and oneelectron.
E an isotope and anion.

5. An atom can be excited to a higher level
A by emitting aphoton.
B by colliding with anotheratom or electron.
C by absorbing aphoton.
D A and B.
E B and C.

6. The lowest energy level in an atom is called
A the groundstate.
B the ionizedstate.
C the excitedstate.
D absolute zero.

7. The longer the wavelength of the peak of emitted radiation froma blackbody,
A the higher thetemperature.
B the lower thetemperature.
C the more visible light itemits.
D the faster the blackbodymelts.

8. A perfect blackbody absorbs only infrared and ultravioletradiation
A True
B False

10. If you know the peak color of a star, you can findits
A temperature
B mass
C radius
D age

11. The chemical element that a particular nucleus represents isdetermined by the number of
A neutrons
B protons
C electrons
D photons

12. Red stars are hotter than Blue stars.
A True
B False

13. Consider two stars of the same size. Star A is two times hotterthan star B. This means that star A is
A twice as luminous asstar B.
B four times as luminous asstar B.
C eight times as luminousas star B.
D sixteen times as luminousas star B.
E equal in luminosity tostar B.

14. Star A is two times hotter than star B. This means that starA's blackbody spectrum peaks at
A half the wavelengthas B.
B the same wavelength asB.
C twice the wavelength asB.
D three times thewavelength as B.
E one third of thewavelength as B.