Smaller worlds are more prone to atmospheric loss via impacts than large worlds because they :

Smaller worlds are more prone to atmospheric loss via impacts than large worlds because they
 
  A) have no plate tectonics
  B) have weaker gravities
  C) are more likely to be hit
  D) have less internal heat

Question 2

A metallic surface is illuminated with light of wavelength 400. nm. If the work function for this metal is 2.4 eV, calculate the kinetic energy of the ejected electrons, in electron-volts.
 
  What will be an ideal response?

Question 3

An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?
 
  A) It changes, but it is impossible to tell which way.
  B) It increases.
  C) It does not change.
  D) It decreases.

Question 4

The Earth's escape velocity is defined to be the
 
  A) minimum orbital speed for the Moon to escape from the Earth's gravity
  B) minimum orbital speed for the Earth to escape from the Sun's gravity
  C) minimum velocity required for an object to escape the Earth's gravity
  D) velocity that objects are pulled toward the Earth's surface by gravity

Question 5

If the energy of a particle in a box in the ground state is E, what is the energy in the state n = 4?
 
  What will be an ideal response?