Popquiz

1
Pop-quiz 6

• Which of the following statements is FALSE
• Wiens law states that the temperature of a black
  body and the wavelength of peak radiation bear an
  inverse relation to each other
• The luminosity of a black body is proportional to
  its temperature raised to the fourth power
• Atoms are capable of absorbing and re-emitting
  photons
• The energy of a photon is given by the formula
  E mc2

2
Pop-quiz 7

• Which of the following statements most accurately
  describes what happens when I HOLD A PIECE OF
  CHALK IN MY HAND
• A gravitational force and an electromagnetic
  force are canceling each other
• Only a gravitational force is acting on the piece
  of chalk
• Only an electromagnetic force is acting on the
  piece of chalk
• A gravitational force and a strong nuclear force
  are canceling each other

3
Pop-quiz 8

• Which of the following statements comparing our
  Sun to another star X located at the outer edge
  of the Milky Way galaxy is TRUE
• They have the same orbital period around the
  center of our Galaxy
• Star X takes a longer time than the Sun to orbit
  the Galaxys center
• The Sun takes a longer time than Star X to orbit
  the Galaxys center
• Star X and the Sun are at the same distance from
  the center of the Milky Way

4
Pop-quiz 9

• Which of the following statements is FALSE
• Keplers first law states that the orbit of each
  planet in our Solar System is an ellipse with the
  Sun located at one of the foci of the ellipse
• We live in an expanding Universe, and yet it is
  difficult to find a parking space on this campus!
• Electrons within atoms can have one of many
  possible discrete energy levels
• Astronomy and astrophysics deal primarily with
  telling a persons future from the positions of
  the planets
• Einstein proposed that mass can be converted into
  energy and vice versa

5
Pop-quiz 10

• Which of the following statements is TRUE
• The Moon is made of green cheese and the first
  astronauts who landed on the Moon discovered this
  very tasty fact
• The wave-particle duality of electromagnetic
  radiation refers to the fact that it can be
  described as a wave and/or as packets or bundles
  of energy known as photons
• Wavelength is directly proportional to frequency
  in the case of electromagnetic radiation
• The luminosity of a black body is proportional to
  the square of its surface area
• The inverse square law states that the flux from
  a star is inversely proportional to the fourth
  power of is distance from us