AY 101-004                                                        Fall 2007
                                   QUIZ #3

Answer each of the following on a computer-gradeable answer sheet. Be
sure to fill in your name and student number (and blacken their circles as 
well). Write your seat number on a corner of the answer sheet.

1. Various kinds of electromagnetic radiation - visible, ultraviolet,
   X-rays, and so on - differ in all these _except_
   a) frequency.                  c) wavelength.
   b) energy.                     D) VELOCITY.

2. If we observe an emission spectrum from a gas cloud, we know that
   A) ATOMS IN THE CLOUD ARE LOSING ENERGY.
   b) atoms in the cloud are gaining energy.
   c) that the cloud has some hot background light source.
   d) the cloud must contain hydrogen.

3. The wavelength where an opaque object gives off its strongest radiation 
    is related to its     
   a) chemical composition.        c) rotation.
   b) size.                        D) TEMPERATURE.

4. The underlying cause of tides is
   a) water under the Moon being more strongly attracted to it.
   b) the different strength of gravity acting on solids and liquids.
   C) THE WAY THE STRENGTH OF GRAVITY FALLS OFF WITH DISTANCE. 
   d) the Earth's rotation imparting a centrifugal acceleration to water.

5. A police officer measuring speeds by using a radar gun is employing
   a) atmospheric scattering.      C) THE DOPPLER SHIFT.
   b) absorption-line spectra.     d) Wien's law.

6. A mirage occurs because of atmospheric
   a) reflection.                  c) dispersion.
   B) REFRACTION.                  d) absorption.

7. The cause of the red color of the setting sun is related to
   A) THE BLUE COLOR OF THE SKY.   c) the temperature of the atmosphere.
   b) the Doppler shift.           d) the behavior of light in water droplets.

8. A rainbow involves all these processes _except_
   a) refraction.                  c) dispersion.
   b) reflection.                  D) ABSORPTION.

9. Evidence that light can act as a wave appears when light
   a) reflects from a mirror.
   b) refracts when passing between different substances.
   C) SPREADS UPON PASSING THROUGH A VERY NARROW OPENING.
   d) is absorbed in tiny volumes of a solid.

10. We would expect to find the coolest stars by looking in the
   A) INFRARED.                    c) ultraviolet.
   b) visible.                     d) X-ray.