As shown in the figure, a man is traveling on a bicycle along a ...

[Redwolflake15]

As shown in the figure, a man is traveling on a bicycle along a straight road that runs parallel to and right next to some railroad tracks. While moving at 10 m/s, he hears the whistle of a train that is behind him, as shown in the figure.
 
  The frequency emitted by the train's whistle is but the frequency the man hears is The speed of sound is 340 m/s.
  (a) What frequency is heard by a stationary observer located between the train and the bicycle?
  (b) What is the speed of the train, and is the train traveling away from or toward the bicycle?

Question 2

The surprising feature of the double-slit experiment with electrons is
 
  A) when both slits are open, each individual electron impact on the viewing screen is spread out over a wide area.
  B) when both slits are open, the impact pattern on the viewing screen is an interference pattern.
  C) when one slit is open, the impact pattern on the viewing screen is an interference pattern, but this interference pattern vanishes when both slits are open.
  D) the overall pattern formed by many impacts is different each time that the experiment is performed, and is thus entirely unpredictable.
  E) when both slits are open, the electrons make precise, tiny impacts on the viewing screen.

[Brenm]

Answer to Question 1

a) 797 Hz b) 9.8 m/s, away from the bicycle

Answer to Question 2

B