At the microscopic level, electric currents in wires are due to ...

[mynx]

At the microscopic level, electric currents in wires are due to
 
  A) electromagnetic radiation.
  B) the great pumpkin.
  C) protons and possibly other ions traveling along the wire.
  D) atoms jiggling back and forth within the wire.
  E) electrons traveling along the wire.

Question 2

A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard later, at which time the line of sight to the aircraft forms a 56 angle with respect to the horizontal. The speed of sound is 325 m/s.
 
  What is the Mach number (the ratio of the speed of the jet to the speed of sound) for the aircraft? A) 1.2
  B) 1.8
  C) 1.9
  D) 2.1
  E) 2.2

[Liamb2179]

Answer to Question 1

E

Answer to Question 2

A

[mynx]

TYSM

[6ana001]

Excellent