1.  Physicists realized that Newton's laws of 
    motion were not adequate under all circumstances
    around the year

      a) 1800

      b) 1850

      c) 1900


2.  In which arena did measurements reveal the
    need for new physical principles?

      a) subatomic particles

      b) radio waves

      c) fluid mechanics



3.  A critical experiment was performed by
    Michelson and _________
    
      a) Lorentz

      b) Einstein

      c) Morley